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My 1995 suburban runs good except when you let up on the gas at low speeds (like pulling up to a stop sign in town, the engine RPMs drop really quick and it almost dies, then it surges and goes back to normal idle RPMs. Seems worse when the engine is warmed up. Could this be the EGr valve sticking ?????
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The transmission may not be dropping in low gear. Manually shift the transmission into low when you come to a stop then shift to second and then 3. See it that works. Could have control valve problems.
Engine light on? Many things can cause this. Mass airflow sensor, throttle pos. sensor, cam sensor, idle control valve, O2 sensor, vacuum leak etc, diagnosis be great. Good luck
Your trottle body may have gunk on it. When an engine idles it lets little air in for just a low RPM run so it doesnt die. If it is gunked up just spray some carb cleaner on a COLD Engines throttle body flag and scrub it off and see it if still idles fine. If it runs fine at higher rpms that is mmore than likely the solution :D Alright Good luck man.
I have a 98 Windstar and it would die when pulling up to a stop sign, slowing when coming to a stop or making a slow turn. According to Ford recall 98E03 EMISSIONS RECALL some vehicles may stall during deceleration when coming to a stop, during slow speed parking maneuvers and/or coasting thru slow sweeping turns. This may be caused by the Powertrain Contro lModule (PCM) calibration dropping the rpms too quickly during deceleration. This involves reprograming the PCM. The revised calibration will allow the engine rpms to drop slowly during low speed maneuvers to reduce the possibility of a stall. Call your local FORD dealership (have your VIN handy) and have them check to see if this recall has been performed on your vehicle.
The idle is set too low, the alternator is not charging enough, poor battery connection, filthy throttle body, dirty air filter are some of the most common causes of stalling at lower rpms.
I'd be curious to the miles on the engine, possible worn rings, poor compression. Start with basics first, be certain there are no vacuum leaks, next look to your fuel system; possible failing fuel pump (low fuel pressure) dirty fuel filter? (I'd start with the filter first, cheapest fix if it is the issue) other concerns could be injectors, plugged or failing (poor fuel spray) run a fuel systems cleaner for several tanks see if it will improve; but change that fuel filter first. Also the volts dropping off would make sence if the engine RPMs drop way off, too slow of a speed the alternator will make little if anything.
I hope this may have helped,
Tom
This may be a pcm problem, but it really does sound like a fuel pump., except for the dash light issue. Your dealer is the best alternative at this point. They have all the tools and scanners that are specific to your vehicle. Probable only cost an hours diagnostic fee. Give them as much info as you can, and tell them what has already been done.
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