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Idle problem and running rich

Tiny
TEXASSTANG
  • MEMBER
  • 2002 FORD MUSTANG
  • 4.6L
  • V8
  • RWD
  • MANUAL
  • 134,000 MILES
My Mustang will idle normally but when the rpms drop from high the car dies out. If I'm coasting the rpms hold at 3000 until I stop, then it dies. The car is throwing P0172 and P0175, so both banks are running rich. The car has new internals, block, upper plenum, iac, egr valve, throttle position sensor, hoses and gaskets.
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Sunday, January 31st, 2016 AT 5:01 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure with a gauge auto parts rent it, check for a vacuum leak see pics for causes and areas to check including air leaks like engine grommets.
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Monday, February 1st, 2016 AT 6:58 AM

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