SOHC stumbling , misfire??

[LOUD240]

Help me! Stumbles like crazy!!!
1990 240 hatch bone stock everything smog intact 5spd conversion 7 years ago
new;
plugs &wires
cap & rotor
new injector plugs
new egr &egr temp sensor
all new vacuum hoses (all)
5 month old cooant temp sensor (both)
hollowed out cat magnaflow muffler
5 month old fuel pump

Car idles fine but stumbles (misfires) under throttle
clears up when on the throttle but comes back when cruising any gear any speed
just timed it to 15 degrees btdc no change

[LOUD240]

anybody??????

[LOUD240]

somebody has got to know?
Just put all new injector seals an cleaned the fuel rail and still misfiring

[Mishkin_707]

How old is you alternator and battery? Get a volt meter and check your alternators output, mine did something similar and found out my alternator was under charging while I was driving and it would charge normal when at idle, the regulator inside the alternator usually go bad, I'm not saying it is your problem but it wouldn't hurt the check, check for loose grounds too, these cars are so sensitive when it comes to electrical

[LOUD240]

I am really tired of the misfire , any ideas??????