1993 Pontiac Grand Prix erotic misses an jerks

Tiny
RATATAT
  • MEMBER
  • 1993 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
I recently been having a bad miss problem, been to plenty mechanics an I also work on cars but.I can start the car an it idles fine forless than a min then misses an jerks. It has a code(42 after I reset the ECM) misses real bad in sperts! I've replaced plugs, Iat sensor, crank sensor, ign module, map sensor, air idle sensor and all 3 coil packs, fuel filter and my fuel pressures at 42psi(ign key on)now wont even start. But it was pooting out of the exaust an once out the intake. Need help Bad! (Lost without a cause).
Thursday, November 12th, 2009 AT 7:38 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
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Thursday, November 12th, 2009 AT 8:16 PM

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