After finally putting the engine in, can only get a spark on cylinders 3 and 4,

have put new set of plugs in, tried changing coil packs around but still no joy, engine starts fine but very lumpy, fuel is getting in ( as i can smell it) have checked all electrics, which seem fine, have checked wiring loom but no obvious breaks, ecu shows as all is okay. revs to max 2500rpm, but wont go any more, checked all pipes and repaired any that i found shagged. what else can it be, SWZ were helpfull, but ive done what they say, but still nothing,

what have i missed as im starting to doubt myself now and getting close to 5 litres of fuel and a box of matches. HELP

Stu

If its only reving to 2500 that would indicate the MAF has had it, but as your only running on 2 cylinders that wouldnt help. As your only firing on 2 then that would be the PTU or harness, but i guess you've tried those? You have put all the leads in right firing order? simple mistake to make