Hello Krystal,
A whole lot of things have to be working VERY well to IDLE & go FAST...!!
Plus "puttering" is not terribly definitive...
(in my mind "puttering" is fire and/or fuel
(that's why TROUBLE CODES are an IMPERATIVE)).
I looked up both engine options on you vehicle ...
V6 2.5L & 4 cylinder (2.0L): both appear to have fuel injection.
While stabbing at answers is geat fun... your car has a
standardized ON-BOARD Diagnostic system that monitors the
systems vital signs... and reports out with DTCs (diagnostic trouble codes).
My best recommendation would be to find a friendly PARTS HOUSE, MUFFLER SHOP or some such automotive
establishment that offers these free analysis...
(autozone practically has trails of candy (not really) leading to their stores (tool loan programs... trouble analysis... comic book level
skill guides... (just not a lot of actual parts).
Their goal is to SELL... but in the process you can get a list of your CAR's complaints... and then tell these folks you have to do COMPARATIVE PRICING... You might not have to file kid-napping charges to get away from them...
Try it... Ask prices first
(but never let anybody put a wrench on your car without a written estimate (worst case scenario)).
http://www.rockauto.com/en/catalog/mercury,1999,mystique,2.5l+v6,1356544
Carnac the Magnificent
Does the engine idle Smooth? If so sounds like your catalytic converter is plugged.
If it were plugged... No air would be getting out (exhaust)... ergo...
No fuel your be mixing with fresh air
to provide for the next combustion stroke...
BUT if that wobbly "answer" get you into a muffler shop...
They can (usually free (??)) read your codes to see what is really wrong...
A whole lot of things have to be working VERY well to IDLE & go FAST...!!
The cat can be too restricted to allow the engine to have power, but at the same time can flow enough for the engine to idle and have minimal acceleration unter light throttle.
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SOURCE: My 1997 Mercury Mystique dies
Check the AIS (idle speed motor) the bypass passage may be clogged with crankcase vent sludge. This is a problem I found many vehicles
SOURCE: 1999 mercury mystique check engine light
Why my Check Engine light comes on?
The engine computer or PCM/ECM
All modern vehicles have a computer or the ECM (Electronic Control Module) that controls the operation of the vehicle powertrain (the engine and transmission). The main purpose of this is to keep the engine running at top efficiency with the lowest possible emissions. With constantly growing demands for better fuel economy and new strictest emission regulations it's not very easy to achieve. The engine parameters need to be constantly and precisely adjusted according to various conditions such as speed, load, engine temperature, gasoline quality, ambient air temperature, road conditions, etc. That's why today's cars have much more electronics than in early days - there is a large number of various sensors and other electronic devices that help the vehicle computer or ECM to precisely control the engine and transmission operation and monitor emissions.
The vehicle computer system has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and your car needs to be looked at. To properly diagnose what is wrong, you need to take your car to a mechanic or a dealer. The technician at the dealership or a garage will then hook up the scanner to the car computer and retrieve the stored trouble code(s). Then he (she) will look it up in the service manual provided by a car manufacturer. The service manual contains the list of possible codes (about few hundreds) and describes what each code means and what needs to be tested. The code itself doesn't tell exactly what component is defective - it only indicates where to look, what engine parameter is out of normal range. The technician will have to perform further testing to pinpoint a defective part.
SOURCE: I cant find my engine coolant temperature sensor
On or next to thermostat housing. You can go to autozone.com and register fro full free online repair manual
Testimonial: "thanks alot"
SOURCE: replacing the belt tensioner and serpentine belt
make you sure are using the right serpentine belt, or looking for another little bit belt , and the other way is damage bearing on the water pump , alternator, power steering , pulleys
SOURCE: i need to see a diagram for the fuse box in a 1999
it should be locate on the inside of the fuse box or panel
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