1991 Ford F-150 misfireing

Tiny
FORDMAN2
  • MEMBER
  • 1991 FORD F-150
Shakes or Wobbles problem
1991 Ford F150 6 cyl Two Wheel Drive Automatic 177, oo miles

i have a 91 ford f150, 300 straght six, it has a misfire when it is idleing and when u try u accelerate, iv already put a new dustributer and cap on it new plugs, wires, throttle positioning sencor, egr vacum sylinoid and new fuil injectors and I check and couldnt find anyvacum leaks and none of this didnt help anything I dont know what else it could be if u could help me pleace do. Thanks
Wednesday, September 1st, 2010 AT 10:01 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,187 POSTS
Is the misfire always there? Have you checked fuel pump pressure?
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Thursday, September 2nd, 2010 AT 6:58 AM
Tiny
MATTHEW.ADELMAN
  • MEMBER
  • 6 POSTS
Had this problem once with a mustang, ended up being a bad new spark plug, it was cracked internally and I replaced it, no more issues.

Also, have you checked the ignition coil? Let me know if either helps.
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Saturday, September 11th, 2010 AT 3:27 PM

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