Surging R33 Problem

[DRIFTPIG]

Hey guys, anyone have any ideas on this problem?

Had a flat battery the other day, so i jumped it from a charger/starter pack. Started up no probs. Keeps going flat but alternator seems to be working fine as its puttin out 14.1 volts. If i leave the alarm off the battery seems to hold charge ok.

Next problem is that since i jumped it the engine warning light is constantly on. Blinks and flashes every now and then but always remains on. Car seemed to drive fine but i just went for a good drive in it and noticed its "surging" really bad. If i cruise doin low revs (between 1000-4000rpm) it sorta revs fine then a couple of seconds later it coughs a bit and feels retarded in some way, then a second later its fine again, just does this constantly while cruising. Seems to go fine when flooring it though. Its not a stock computer either, its running a power fc. Im stumped really. Im not sure if the two problems are related or completely seperate. Im thinking maybe i've shorted something out or done something to the power fc by jumping it? Any ideas/help pointers would be more than welcome as i'm struggling to find a workshop thats not snowed under for weeks!!

[DRIFTPIG]

cant anyone help me out here?

[danielson]

if you just jumped it off another battery and not from a running car, i highly doubt that you damaged anythn. the problem with a direct jump start is that the emf from the other cars charging and efi system will interfere with your electronics, and can surge your computer. but sounds to me like the power fc has lost a part of the programming due to the power loss. OR you have a fuel prob. Also, Take out your coil packs and check the little clear window for and discolouration or cracking... i had a similar prob on my rb25det, and it turned out that one coil pack was dead.

hope i helped