possible faulty injector, running on 3 cylinders

[rickye]

Having a problem atm, car was driving fine, running 100% untill about 3 hours ago, stopped it to talk to a mate in the town, when i went to start it again it turned over a couple times(odd as it usaly goes first go) and when it started it sounded like it was running on 3 cylinders, abit of white smoke out the exhaust, engine was shaking and down on power

so far ive cleaned the filter housing, wasnt any dirt in it and was full, so dont think the tank filter is blocked

took off the intercooler before i came in the house, started her, and slagged all 4 injector lines one at a time, when i crack injector 1 or 3, it changes its note, but keep running just about, when i crack injector 2 or 4, it stops

atm im thinking a faulty injector, as it was running 100% when i stopped it, then when i tried to start it, it started playing up

its on a lucas, only injectors i have are bosch, my 1st dturbo when i bought it had bosch injectors on a lucas pump, it ran but was dead, would it be ok to stick 4 bosch injectors in it to get it going, its getting my 11mm pump, timing belt etc next weekend, but i dont have the timing belt yet or id do that now

any help would be great, cheers

edit, just had a quick flick through youtube there, could it be an injector stuck open

behaving about like this but only thats 6 cylinder, dturbo obv 4
http://www.youtube.com/watch?v=2Lh1IdMQfeQ