Have a 1994 f150 4x4 302 auto, Has developed a major miss under load. Have tryed a bunch of stuff with no success. Heres a list of things replaced-- cap,rotor,coil,plugs,wires, tps,coolant,iat sensors, new fuel tank,pump assembly,pressure regulator,injectors, oil pan,oil pump,timing chain,front cover, water pump, exhaust manifolds, y-pipe, complete exhaust (no cat) All these things were over time (1to 2 years) holds good fuel pressure at all times,It does throw some codes for egr system? (the green and yellow and red hard vaccum lines that hook up to the valves next to the coil are broken, but have been for a while, this miss is new. Also took the ecm out and checked for cap leakage-all good. any ideas ?

thanks,
scot

 

do a compression check

 

will do, never really thought about that... thanks.. I see your from York,PA. So am I (red lion area, work in york)

 

ah ok...where do you work in york

 

As stated by dj check compression and replace those vac lines.

 

OK did compression test, here are the readings 1=148, 2=160, 3=155, 4=160, 5=160, 6=158, 7=150, 8=158 all look good to me.

work @ American Speed Center

scot

 

Wondering about the TFI module or pick up in the distributor...

scot

 

oh cool...ive stopped in there from time to time

 

They do seem good to me
Check that. Also check your coil for proper power outputs.

 

Coil was replaced with a MSD one, not saying it can't be bad though.

scot