Really need some help

[Chovies300]

I have only had my 300zx for about 8 months and i know nothing about them so im lost on this. My car is a 1991 and recently it lost a ton of power so i had it checked out. Two fuel injectors were shot so i ahd them replaced and it helped a little but my car is still sluggish. By sluggish i mean i can floor it in first gear on wet roads with super bald tires and i can't even get the to slip. It getting twelve miles to the gallon and is occasionally putting out white smoke. It is also idling really hard and having trouble starting. A buddy of mine says he thinks it might be the MAP sensor i was just looking for any help i could get.

[evildky]

you can start by telling your buddy these cars have no map sensor the next step would be to verify that the car si running on all 6 cylinders (with the car ideling unplug the cop's one at a time, each one shoudl cause the idle to drop if not it's a dead cylinder) if the car is still running on all 6 cylinders the next step is the check the ecu for codes, let us know how this comes out and we'll help you find the source of the problem