EGR seems to be opening too long. Have you tried cleaning the EGR passages?

Answered by KHLow2008 (expert)
39,832 answers provided

Yes I cleaned all egr passages and checked to make sure I was getting exhaust out of all passages and tubes.

Response from karlandee
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Something is telling the computer to keep the EGr opened for longer than necessary and it could be the O2 sensor. If the sensor is not OEM, it can cause such problems.

The other thing to check would be the PCM and MAF. Ensure the TPS is working correctly

Answered by KHLow2008 (expert)
39,832 answers provided

Yesterday I bought a brand new bosch oxygen sensor and the car has alot more power but still hesitates. I will check the tps and maf tommorow, Thankyou, KARL

Response from karlandee
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Just installed new tps and adjusted- car runs better and no surging at 60 mph but still hesitates off idle at stop signs.

Response from karlandee
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Did you clean the throttle body?

Answered by KHLow2008 (expert)
39,832 answers provided

Yes I cleaned it completly.

Response from karlandee
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Did you check the ignition timing and valve clearances?

What about the MAF?

Answered by KHLow2008 (expert)
39,832 answers provided

Timing is set to 10 degrees and vavles have been adjusted, MAF is next on the list. Thankyou for all your help, KARL

Response from karlandee
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