i have a 92 Nissan 200sx CA18DET and recently i put a new engine in it with 60 000miles. in the morning when the car is cold it takes 4 or 5 turns 2 start but after that its fine for the rest or the day. it runs ok but when i put my foot down for power it misfires like Fu#k and it goes no where but if i put my foot down VERY easy on the accelerator it seems 2 b ok. i changed the plugs and there is a slight blow out on the manifold as i think the gasket needs replaced.please help me sort this out as it is drivin my crazy!thanks

 

i'd recommend checking your timing before anything else....