I have a bad idle and surging problem after it warms up. on 2003 Ford F-150

If I un plug the MAF it seems to clear up. Replaced MAF about 500 miles back. Replacing TPS and have replaced Vac sensors on EGR AND CANISTER vent valve.

by in Spokane, WA on March 31, 2014
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1 answer 3 comments
ANSWER by , March 31, 2014
Did you check if there's any vacuum leak somewhere?
COMMENT by , March 31, 2014
should have been 5000 miles, I'm checking on a smoke test to check for vacuum leak. Seems you can't do it with spray as the PCM will try to compensate it. I don't know the system well enough to understand why unplugging the MAF would fix the problem.
COMMENT by , March 31, 2014
If there's any vacuum leak after your maf sensor it will act up
COMMENT by , April 01, 2014
I think your right on with the vacuum leak. I changed the TPS and drove for 40 minutes and no problem. I did get a rich burn code, cleared it and it did not come back. Will replace problem PCV hose on back of intake and drive again. Hope this is the vacuum problem.