Yes its a different motor, but its the same enough that it should be a simple drop in. Your problem is either electrical or timing related. Providing you used ALL of your original electronics and injection system you should not be having issues. ALL = FP ecu, loom, injectors, MAF, dizzy (if it has one), tps and anything else attached to the engine.
Aside from this, maybe the timing is up the ****? Check the cam timing, were they messing with the timing belt at all?
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