I have a 1988 f-350 with a 351 w i replaced the ICM got truck to start but won't stay running replaced plugs wires cap and rotor fresh fuel new fuel filter/pump new battery truck starts but runs like c r a p can't drive it give it gas and it stalls TPS new all vacuum lines new HELP any ideas

 

How much fuel pressure do you have?

matt

 

36 psi this being in the normal range It's fine

 

Not sure about this, but here goes.......

Do you have an inertia switch that may have been tripped ???

Do you get the 1-2 second fuel pump prime when you switch the key on ???

Do you have a dual tank selector switch in the dash ???

Inquiring minds need to know

Bob

 

yes fuel pump works fine only has single tank where would that inertia switch be located?

 

Have you played around with the Timing??

 

Has anything under the hood been removed or changed from the stock system which made the truck "runs like c r a p can't drive it" or did it run fine and then suddenly start running poorly ????

Do you know the history of this truck..... i.e. Did you just purchase it ???


More information please.

Bob

 

It may or may not provide a clue but no one else has suggested it so I will.

Pull the codes from the computer. You don't even need a code reader to do it.

 

i replaced the icm which is on the distributor because there was no spark the ignition coil is new as well as the stuff i listed in first post i bought the truck for cheap it seems to be all stock from the looks of it i did the code read test and got nothing back????? my check engine light works but isn't showing when truck starts i did replace heater core because it leaked like no tomorrow at a major loss for what it could be ...........

 

Pull the spout and see if it runs better or worse.

 

did that nothing changed i also put timing light to it and it seems to be right on time
i triple checked the wiring from cap to plugs they are correct

 

Great, thank you for providing "more information."

You're going to have to have patients with this one.
Everyone that's going to try and help you here will be working your problem from simple thru complex.
Don't get frustrated.
Since you don't know the history of the truck, it's going to take a while (especially over the internet) to get you up and running correctly.
There may be no "change this part" magic fix.

I'd do these things this first and here's my reasoning why:
Pull the computer out of the truck and verify you have in fact the correct computer for your truck/transmission system.
Obviously if the previous owner (you don't know the history of your truck) replaced the computer with a wrong one, your truck may NEVER run right even if everything else checks out as good.
Since you'll have it out to verify you have the correct one, and assuming it is the correct one, open it up and do a visual check to see if here's any obvious problem(s) ie. capacitors leaking, burnt IC chips, burnt circuit board, etc.
Click this link:A9x ECM's (and same years ECM's) Failures Due to Age
If you have a computer that is visually bad, it will perform bad and you'll need to replace it or have it repaired before you go ANY further.

Those would be the first two steps that I'd take, given the fact that you don't know the trucks history, before you go ANY further.

This is just my take....others may disagree.

Bob

 

I read the flashes by grounding the single plug to battery neggative side counted flashes but may have read them wrong .......

 

I just updated last my post, please re-read for additional information.

Bob

 

I had the computer checked out at dealer they said its fine and itvis the correct 1