this car has been having a plagueing misfire for the better part of almost a year of ownership

its a constant miss at idle... part throttle and WOT

i have replaced...

ECT
ACT
CAP
ROTOR
PLUGS
WIRES (came with new motor, but had them replaced on old motor still did it)
COIL
TFI MODULE
DISTRIBUTER (stock one came with new motor)
BAP
02 SESNORS
TPS (stock) SET AT .96
TIMING CHAIN (double roller on new motor, came like this)
VACCUM IS ROCK STEADY AT 19lbs AT IDLE
FUEL PRESSURE REGULATOR (set at 38 vac off)
CLEANED THE IAC
DELETED EGR (and bought the EGR plug in simulator thing)
TIMING ADJUST MULTIPLE TIMES (10*, 14*, 12* nothing works)


THE WHOLE ****ING ENGINE lol (seriously i swapped out the motor that was doing it orginally with a 87GT motor and it is still doing it)

motor still does it

at idle you can hear the miss, and hte engine runs rough alot of shaking in it... then at throttle it has complete dead spots... and when its cold it will making popping noises and buck under acceleration while its in its dead spot, then it will kick out of it and just have a complete dead spot again.

any help? LOL

 

btw while it is doing this i have monitered both FP and VAC and both are rock steady while it is doing this, no needle jumping or anything.

 

maybe an injector or even the injector harness, my harness took a crap and it took me awhile to figure it out but when i replace it, no more miss. also check your ground strap? i had some weird stuff happen to my car when the ground strap needed to be replaced!

 

i have a 2001 mustang and it sounds like i'm having the same problem. i cant find a solution either.