jw

Ive got a reoccuring problem with my '89 5.0 Gt 5 speed, you guys may be able to help. When cruising along at 25-40 mph with hardly any throttle the car is constantly jolting and missing slightly, as soon as you touch the gas its fine. Ive had lots of people give me different answers from clogged injectors to a faulty TPS - has anyone had the same problem?? Ive also bypassed the air pump and stripped all the emisions gear from the engine ( I live in Grand Cayman and luckily we dont have emissions tests here!), this ive also been told may cause problems?

Thanks

fordguy17

whens the last time you did a tune up? air filter, spark plugs gapped properly, fuel filter, oil change etc. also replace the dizzy cap and wires. make sure your timing is set anywhere from 10-13 degrees or so if you are running 87 octane.

stanglx2002

i agree if u have done a tune up then the tps might be bad

redmustang83596

mine does the same thing... i cant figure it out, i just figured mine was the timing and i havent adjusted it, you said 10-13 on 87 octane... how about on 93 octane?

stanglx2002

you can go higher with higher octane but all engines are different it just a try and see with timing or go and get it dynoed for the highest timing you can get

vfast

sounds like your lugging the engine

redmustang83596

lugging? what do you mean?

vfast

this is what happens when your in a high gear with lil or no load at low rpm. at a low speed

redmustang83596

no way, i always keep the rpm above 2K, cam doesnt like to be driven lower then that, it happens all the way up to maybe 3K and its only when im not on the throttle, if i step on it it goes away until i let off... sry if i took your post, but we have similiar problems....

vfast

what cam?..and I think you don't have the same thing...sounds like you have what we call bucking......you possibly need a chip to fix