1998 Chevy Cheyenne Fast idle

1998 CHEVROLET CHEYENNE
142,000 MILES • V8 • 2WD • AUTOMATIC
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JD438
  • MEMBER
  • 1 POST
I have had some problems with my 98 chevy that started out with a rough idle. I took it in and they said it had a bad MAP sensor and post cat o2. I replaced both and still had the rough idle. I cleared the codes and ran again, got P0151, P0300, P0507, P1153. I checked the right bank plugs and they were fouled and I replaced. Replaced the right bank 02 and cleared the codes. It runs better, but now I still have the P0507 code for fast idle, 1200-1300 in park and about 1100 in gear rolling down the street. What is causing my fast idle?
Feb 28, 2009 at 4:33 PM
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BILLYMAC
  • CAR REPAIR CONTRIBUTOR
  • 2,204 POSTS
idle air control motor or blown intake gasket
Feb 28, 2009 at 7:47 PM
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MASTERTECHTIM
  • CAR REPAIR CONTRIBUTOR
  • 4,750 POSTS
if one bank of plugs got fouled that is sometimes a sign of a leaking fuel pressure regulator. its the passengers side that fould out. also check for a restricted converter if you have loss of power too.
Feb 28, 2009 at 7:53 PM