Question about 1997 Ford F250 SuperCab

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Ford f250 runs ruff and will not idle

I have an 1991 Ford f250 with a 5.8L gas engine, it runs really ruff and will only stay running if u work the gas up and down. it will not idle or accelerate without bogging down and will die if I hold the gas steady. I have replaced the plugs, wires, distributer cap, rotar. all where showing sings of ware anyway. I also replaced the fuel filter, fuel pump ran a pressure check on the fuel rail and the pressure is over 30#. ran a vacuum test on the pressure regulator and it held at over 30 lbs vac for over 30 min. I am running out of ideas and any advise would help

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  • Ford Master
  • 14,036 Answers

Fuel pressure should be 35 - 45 psi.could have faulty tps sensor.could have intake vacuum leak or ignition timing valve timing off due to worn timing chain.do engine vacuum test replace all vacuum hoses bad leaking egr valve diaphram or gasket will cause engine run poorly.

Posted on Jul 29, 2013

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 1983 Ford F250 will start but won't idle without holding down gas

Its a ford! its cold blooded!! give it a minute, or adjust your choke, idle screw or timing. c'mon dude- even I know that. -BobbyGirl

Posted on Apr 05, 2009

canbruce75
  • 1776 Answers

SOURCE: 1997 Ford F150 4x4 5.4L

I would take the truck to an autoparts store and have the fault codes retrieved from the computer. Most stores will do the scan for free. I would lean toward a faulty throttle position sensor, but that's just speculation. The fault codes should narrow the problem down. Hope this helped and best wishes.

Posted on Jul 25, 2009

  • 123 Answers

SOURCE: 1998 Ford F-150 4.2 V6 starts and idles fine ibut bogs when step

i had a van do this same thing to a tee turned out to be a broken key pin in the harmonic balencer causing the timing to ****** replaced balencer and ran like a dream there is a crank sensor grid on the balencer when the key pin broke it trew the timing off

Posted on Jan 14, 2011

mec_ronnie
  • 2 Answers

SOURCE: 98 FORD ESCORT ZX2

1998 ford escort sport engine started making a tapping noise and engine light started flashing. Had oil and water at normal level.
Car has 110,000 miles. Been serviced regularly!

Posted on Mar 30, 2011

SOURCE: Ford F150 engine backfiring, running/idling rough

I Have a 1999 ford f150 4.6 that back fires and is just running really ruff when idling alot of nack fire a sord of like a pulse going on what is my problem?

Posted on Oct 12, 2011

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