poor acceleration, no power on 1997 GMC Yukon

97 Yukon has poor acceleration above 20 MPH. Sometimes problem goes away for a few days. Just replaced fuel filter, Had fuel pressure checked and is is 62 PSI. Had MAF sensor and injectors replaced a few months ago. Please help.

by in Seattle, WA on February 13, 2011
1 answer 2 comments
ANSWER by on February 14, 2011
Is the "check enigne" or "service engine soon" light is on? A fault code would help but they do not "diagnose" problems- they just give us an area to focus on. Good luck, Greg
COMMENT by on February 16, 2011
No. Unfortunately, no error codes at all after MAF sensor and an O2 sensor replaced. I was looking at the other problems in this category and now wonder about the EGR valve. What are the symptons if this has failed?
COMMENT by on February 17, 2011
The egr valve will only cause a rough idle or stalling at idle. Have a muffler shop test for a plugged catalytic converter. Greg

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