what all can cause misses & sluttering after 2000 rpm ?

1998 FORD EXPEDITION
165,000 MILES
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HNC
  • MEMBER
  • 2 POSTS
i've changed the plugs, plug wires, coil packs, head gasket, cleaned the injectors n all !

it feels like it's sufforcating to mainly go up a hill !
Jan 19, 2012 at 11:50 AM
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DOCFIXIT
  • ✓Experienced Mechanic
  • 18,828 POSTS
Have exhaust back pressure checked may have restricted CAT
Jan 19, 2012 at 11:57 AM
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HNC
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last year i had a bit of the same issue and the guy at the muffler shop recomended i change the catalytic converters which i did n then found out it was the fuel pump

but i remember also that he put on universal catalytic converters that only have one housing on each side instead of the 2 like the original

could that be the problem ?
Jan 19, 2012 at 12:33 PM
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DOCFIXIT
  • ✓Experienced Mechanic
  • 18,828 POSTS
The test will tell also maybe good to check fuel pressure. Non OEM Cat tend to fail is check engine light coming on?
Jan 19, 2012 at 12:56 PM
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CADIEMAN
  • ✓Experienced Mechanic
  • 3,544 POSTS
does it start on spray in the intake?
Jan 19, 2012 at 1:02 PM
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