severe hesitation when engine cold on 2001 Chevrolet Prizm

I have had the carbon blown out-Chevy dealer bulletin(did not help, cost $160) I have had the fuel pump replaced-did not help, cost $250. I have cleaned the mass air sensor contacts, cost $4, hopefully it will work Got any other ideas? Only a problem in summer but has been going on for 2 years.

by in Springfield, IL on June 19, 2009
4 answers 2 comments
ANSWER by on June 19, 2009
I would suggest that you have your shop keep your car overnight so that they can road test your car in the am with a scan tool connected. Perhaps one of the sensors is acting up and it will show up during the road test. If there are any fault codes stored in the powertrain control module they should be addressed. It may take a few days of test drives to isolate the cause of the fault and confirm the repair. If the shop cannot duplicate your concern then offer to road test with one of there technicians so that you can "show" then the problem you are trying to correct.
ANSWER by on August 13, 2009
Hi Jerry, did you ever figure out what the problem was? I have the exact same issue with my 01 Chevy Prizm, and my mechanic can't quite figure out what's going on with it.
ANSWER by on August 20, 2009
Jerry, I've had the same problem in the summer time. From what I've found on the internet, it seems like the MAF is the problem. I cleaned mine out with electronic contact cleaner once, but it didn't help. I was just about to buy a new one but last night I decided to clean it one more time. I noticed that both wires seemed to have stuff on them that didn't come off by spraying. At first I assumed it was part of the sensor but then I decided to wipe the wires with a q-tip. The stuff was dirt. I'm really hopeful that was the issue.
ANSWER by on June 19, 2010
I have the same problem except I replaced all the sensors and not the fuel lines or pump because they are all working well. if you find out please let me know.
COMMENT by on June 21, 2010
Update from my response last year. Cleaning the gunk off of the Mass Air Flow sensor fixed. Carefully clean the little internal wires with a q-tip. I haven't had a problem since.
COMMENT by on February 15, 2011
This is what I done also, and it corrected the problem, after spending over $300 on other things.

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