Cap ,rotor ,spark plug wire , spark plug could misfire....
the check engine light flash because it's a severe misfire and fuel go to converter catalyst.
Testimonial: "all of those thing have been replaced by myself within the last year, as well i had the timing reset within the last 3 months, still not sure what to look at, this is the first time iv had this problem, but for several months it has had a hard time starting even with a brand new starter?"
SOURCE: 2001 GMC Yukon Flashing Check Engine Light
dear sir the flashing check engine light means the truck was misfiring at the time of the incident .If the light is still on you can go to auto zone they will pull the codes for you and reset the light if you like.but if running good now then probably nothing to worry about .
SOURCE: The check engine light stays
its easy too replace but you need too reset your cmputer first too see if the light stays out before you go and buy the egr valve
disconnect the pos side of the battery for 5 min that will reset the computer,if the light comes back on then get the egr valve then you will have too reset it again
SOURCE: 1994 GMC JImmy 4.3 V6 running very roughly
fuel pump sock or try the egr valve to see if it is stuck open all the time. can't remember if that one has the digital one and a vachumm type as well, next would be the evaperative canister purge valve.
SOURCE: my 79 Chevy has rough idle/miss at idle but runs fine otherwise
It sounds like you have a vacuum leak or a carburetor problem. Check all hoses and the line going to the brake booster for cracks or leaks. Make sure the carb bolts are tight at the manifold. You can check for leaks using some carb cleaner. Spray around the base of carb while the engine is running, any leak will cause the engine to sputter when the spray hits it. You may want to look into rebuilding the carb or replace it. If its the original its a Quadrajet, they are not the easiest to rebuild but not impossible. If you rebuild it yourself, make sure to get the numbers off the carb so you can get the correct rebuild kit and accelerator pump. Plus you should replace the float when you rebuild since its 30 years old. A thorough cleaning of the carb is crucial before rebuilding. The fuel mixture screws have caps on them so they wont be altered after assembly from the factory. You'll have to remove those caps to remove these screws before cleaning. You can probably find some good info. on doing this at a good parts store. I hope this helps you.
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truck was running fine before i accelerated to pass another vehical and then decided to start sputtering, thth is when the check engine light started flashing?
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