Ok, so i jus swapped a 77 motor into my 78 shell. Im using the 78 ecu. I also have a 240sx 60mm tb with the 240sx tps. I never touched it. i pluged everything back where it supposed to be. Now when i start up the car. I can rev it up a bit for maybe a few seconds then it'll begin to stall and if i try to give it gas, the rev's drop and car tries to stall n when i let off the gas, the revs may come bak up a bit then it'll jus stall most of the time. wat is going on here? can anyone help me figure this out? Oh yeah, i also removed the air regulator.

I would check the timing, make sure the distributor is not in backwards, and that the cables are all in the right firing order, 1-5-3-6-2-4. one time i had it sorta run and it would backfire a bunch, and it turned out i did the firing order in the wrong direction around the cap :stupid:

never had that problem, and who knows, it may be something with the fuel injection? i would check spark first though if i was having problems like that

it seems to rev perfectly fine for those few sec's it does run, and run rite.

Double check the vacuum lines, you may have bumped one and now you have a vacuum leak, or you may have one that isn't plugged (or is leaking)since you took off the air regulator.

gonna try to check my fuel filter n such things on wed's or maybe even tomorro. but hopefully i'll figure it out. Do u think it could be my vaccum advance?

ok, so i've tried to plug the air regulator back on. no luck. I've also jus installed the jsk fuel rail. I guess its helped a bit. i can actually have the car running for maybe 1 min tops. then it begins to die out after like 30secs. So wat do u guys think? altenator? fuel pump? those are the only things i can think of right now.

ok, so i tried to swap the fuel pump. still no luck. I guess i have to try n swap the wireing harness n check the altenator.

Who has done The 60mm tb swap? Help me out here. Maybe im running to lean my friend thinks.

It also back fires out the intake when it begins to stall.

i had the same problem when i 1st got my 77 and it ended up being a combination of clogged fuel injectors and a rusty gas tank. i ended up replacing the injectors and having the gas tank coated and this solved my problems...

the only problem w. you doing this is that it cost me about $400 to do all of that. i would try to verify the problem before just replacing stuff..

sorry i couldnt help more

my car ran perfect with everything im using when everything was still on the other car. i swapped the gas tank and fuel pump. my dash lights n things are acting up too. so i tink its my wiring maybe? we'll have to see, now i have to deal with fixing my van first. need to replace the head gasket. =T soo much too do. soo little time