Question about 1996 Chevrolet Suburban

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98 chevy Z71 305 idles rough after warm up.

It gets a rough/erratic idle like it wants to die, exhaust stinks too. I have cleaned EGR & MAF not sure what next.

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Catalytic converter plugged restricting exhaust smells like rotten eggs/sulfur replace

Posted on Sep 29, 2009

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Ford escort zx2 code po171


What is model year? How long since a tune-up?
With idle issues, check and clean idle air system, see if it helps? Use a gage and check proper fuel pressure, key on engine off. On some ford vehicles, with everything off, unplug the maf sensor, where applicable, take the vehicle for a spin, if it does a lot better, have to check the maf system, that includes, sensor--wiring circuits--pcm.
The basics on a rough idle, is to check for a leak of some kind, fuel--egr--vacuum.
Positive fuel trim at low speed and load, the first thing, look for vacuum leak.

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Every time i stop at a four way stop the thing dies and i have to put the car in park and turn the key and gassing it before it starts. Please Help.


3 areas of concern are as follows:
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  2. Bad EGR (Exhaust Gas Recirculator) valve - erratic idling, skipping
  3. Bad TPS (Throttle Position Sensor) controls idle under different conditions ie cold, hot, ac etc
Your problem may be any 1 of the 3 or a combination. Best advice is to get a free diagnostic test done (most chain auto parts stores will do this test free) and come back with the error codes, These codes will help to narrow down where the exact problem lies.

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