Having a qualified repair shop do diagnostic's is probably what you should do , rather then replacing a bunch of parts that are not needed . Testing fuel pressure an flow , engine managment sensor input's to the PCM - engine computer . Do you know what a professional scanner is ? mass air flow sensor data , fuel trims ,short an long term , are the O2 sensor's switching normally ,
003 Engine Peformance Tests Scan Data Tests
SOURCE: 2002 Impala 3.8l v6 major hesitation
Have someone do a back pressure test on you catalytic converter. I had the same problem and it turned out that my converter was almost completely plugged. I was also getting a check engine light indicating a misfire on cylinder 4. Once the converter was replaced, the problems went away.
SOURCE: My camaro is idling at 3k rpm in park
if you are not the original owner then the previous owner may have set the idle high, if you take off the throttle body there should be a little screw that will set the idle by keeping the intake valve open more if you unscrew it then the idle rpm will lower
SOURCE: 1995 Chev S10 4.3L V6 rough idle and under power
This make/model has a chronic problem with EGR clogging. If you have a dashboard indicator showing "check engine" most likely it is a trouble code indicating and EGR (exhaust gas recirculator) valve problem. Symptoms are rough idle, and surging and stalls.
What happens is sediments from the exaust manifold get sucked up into the valve when it opens, then stick in the valve and keep it from closing. When the valve is open when it should be closed, the engine runs very rough.
I removed my egr and then dislodged the sediment (pea-sized debris) and then re-installed the valve. Three days later, the same "check engine" and same rough idle. I must have did this at least three or four more times.
What I found that gave me a permanent solution was an aftermarket filter gasket that keeps debris from clogging. I don't remember the name of the product, but a search for "EGR filter gasket" may lead you to the product.
Install the gasket between the EGR and the exhaust manifold and you should be good to go. Note: on 1995 and newer models, disconnecting the EGR from the wiring harness (common on R&R) may require the computer to be reprogramed.
SOURCE: when let off of gas truck bogs out then idels back to normal
OBD I Code Retrieval and Typical Code List when holding at 1000 to1500 hundred rpms truck runs rough let off gass and bogs out then idels back to normal. at any speed it does this just when i let off if any one knows please contact me
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