supernova572

I recently bought a 1986 Mustang with the 5.0 HO 302 . The guy i bought it from had put a TPS from a 351 on the motor and it had a miss when the car warmed up when first hitting the gas. I replaced the TPS with the correct one but the car still has the hesitation. When the car is cold it wont miss when hitting the gas but after it warms up it will miss and then accelerate, any suggestions on what the problem might be?

grabbem88

can you do a code check?

sounds like the egr system isn't plugged in/or faulty...but i'm not there to help..so i can only guess and guide you in the right direction

supernova572

Yea i rechecked that just now, its plugged in but it doesnt have the vacuum line hooked up to it, think that might be it?

grabbem88

an un metered/controlled vacuum leak will/can be your worst enemy.

grabbem88

closed/open loop speed density plus a vacuum leak worst nightmare right there

supernova572

So i should be able to just put a hard vacuum on there and try that right?

grabbem88

look at the vacuum sources right behind the pass strut tower see annything?

if not plug it see what happens

supernova572

Ok, just closed up for the night but i will start checking that tomorrow and get it hooked up, any thing else i should be able to check to stop it if that doesnt do it?

grabbem88

a quite a few,but i hate throwing a bunch out there till one is eliminated

btw what kind of shape are your o2's?

intake air charge sensor?..pass intake front?
coolant temp sensor d/s front on intake...simple stuff to go out on an older used second car

j-wigg

my egr is hooked up with no vacuums lines (speed density).
tps calibrated properly?