1988 f-150, 302, i changed the injectors because of a constant miss. previous owner changed the # 8 injector but put the wrong one in it. I put correct ones in and it idels a little high but is smooth. Driving is rough, miss's under a load or acceleration. any ideas???

Chris Beck

Asked by Oct 14, 2013 at 03:11 PM about the 1988 Ford F-150 XL Extended Cab LB

Question type: Maintenance & Repair

Idel  is a little high, but the issue is the miss under a load or acceleration while driving. rev it in park and it runs great.

4 Answers


Have you tuned it up? New distributor cap & rotor, new wires, and spark plugs (gapped to specs)? Sounds like an ignition problem. I'd start there first. HTH. -Jim

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Chris Beck

yea that was all done a few months ago.


With the high idle I'd suspect a vacuum leak. Check for that. Also, wait 'til dark and open your hood start your truck and look for arcing. This will be seen as blue flashes of light under the hood. Rev the engine a few times too. This may reveal the problem. If all is ok, next step is to run a compression test. HTH. - Jim

Chris Beck

ended up being IAC and TPS. runs great now. thanks..

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