2002 Pontiac Grand Prix Rough Idle barely stays running

Tiny
ERIKMEDER
  • MEMBER
  • 2002 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 145,000 MILES
Hey there. The other day I went to take my car for a drive and it started fine and when I started going down the road my engine lost power the temp light came on and it bawged way down. I had to limp back to my house. Waited a day went out and started it and the temp light is off but it still barely stays running almost stalls and what not. So i'v read that it could be the catalytic converter. And the service engine soon light is on it has been on for about 2 years whenever I get it check they say it is the gas cap not seating correctly.
Monday, February 8th, 2010 AT 7:11 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Gas cap will set an EVAP code, which could or could not be a cap.

I find it hard to believe that the only code you are getting is the EVAP code. I would try another mechanic or store for future code reading.

While convertor could be the problem, have a convertor backpressure test performed to be sure.
Convertors are not cheap.
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Friday, February 12th, 2010 AT 8:19 AM

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