Idle problem and running rich

2002 FORD MUSTANG
134,000 MILES • 4.6L • V8 • RWD • MANUAL
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TEXASSTANG
  • MEMBER
  • 3 POSTS
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.
Jan 31, 2016 at 9:01 AM
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HMAC300
  • ✓Experienced 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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Jan 31, 2016 at 10:58 PM
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