c20xe running rough miss fire coughing etc

[reecegsi]

Hello

i have a corsa running a c20xe dizzy engine which is running really rough on startup car will not tickover it will start then tickover for say 10 seconds then cut out but will start straight back up once reved it coughs and splutters but if pressed lightly it will rev up i have changed/replaced:

Cts (no difference)
Icv sitting in carb cleaner over night (made a bit of a difference as wen warm it does tick over but its hunting all the time)
Compression tested 145-150 psi in all pots
when afm disconnected it cuts out?
Tps when disconnected revs up
Removed dizzy cap and cleaned all points of contact etc so there shining
all plugs were black and sooty
all wiring earths etc have been checked

it had plugs and magnecors 1 month ago and cts couple days ago i noticed it had a 3.0 bar fpr so i changed that to a 2.5 one and its still a bit lumpy running

i have just bought afm coil and dizzy cap so they will be fitted weekend

Any other ideas as im getting sick of this car now!:mad:

[gaz w]

try cleaning the air flow meter

[Jeff16v]

damaged wiring, have you flashed ecu codes?

[reecegsi]

try cleaning the air flow meter

whats the best way of cleaning afm? I got told not to spray carb cleaner as it damages the insides?

[reecegsi]

damaged wiring, have you flashed ecu codes?

dunno bout wiring checked all earths and seem to be tight? And no codes eml isnt on?

[blue_peg_16v]

Sounds lime an air leak to me check all greatness etc for splits

[gaz w]

ive used carb cleaner before it didnt do it any harm, just leave it to dry before you put it back on

[gaz w]

what colour injectors has it got in it

[reecegsi]

Sounds lime an air leak to me check all greatness etc for splits

wouldnt it rev up when theres a air leak?

[reecegsi]

what colour injectors has it got in it

cream injectors standards for a early xe i did notice it had a 3.0 bar reg on but thats now been changed to a 2.5 one

[blue_peg_16v]

wouldnt it rev up when theres a air leak?

No not really as the mixture will be weak as it's getting unmetered air so not enough fuel

[reecegsi]

Hmmm ok well i will be giving it a good luck over tomoz so i will see what happens

[reecegsi]

Ok think i found a few things one ever since changing fpr i cant get pressure it just dribbles out when i push valve on rail? Also my magnecors are arking? off each over or l piece is that the leads need changing? Other then that everything else is fine