90 sohc help. PLEASE HELP NISSAN TECHS!!

[SCKA24E]

i have a Manual 90 240sx w/ 145xxx miles ive replaced just about all the obviouse , spark plugs, o2, cleaned MAF, cap, rotor, plugs, coolent temp. snsor, oil sensor, tried to adjust timing,cleaned throttle body, changed pcv valve, and my car still runs real bad , it surges hesitates, accelerates slowly and lags at times i get about 16-18 mpg and ai have a pretty bad fuel smell, i tried changing 2 fuel injectors which seemed to be leaking and it helped a lil for about 2 days then just got worse. at idle my engine shakes pretty bad ( misses alot) and i had to turn my idle speed up because it started ideling at 550 rpms, i would really appreciate yur help as no one has been able to help me for 5 months now. if it helps latley when i turn my ac on the car barley runs, but this just recentley happened if been battling the other problem since i bought the car. PLEASE SOMEONE HELP!!..

[elwesso]

When you installed the new injectors did you install new O-Rings..?? Sometimes they can leak when you dont use new O rings.....

have you cheked the resistance on them also?

[NISTECH]

Where did all your parts come from? new or used?Also have you tried to pull codes out of the ECM?

[SCKA24E]

all my parts were new besides the injectors and coolant temp sensor, my ecu gives a 55 - no error.

[180fan]

Smells like a MAFS issue to me. Wiggle the plug or try a different MAFS. A MAFS issue reamed me for 2 or 3 weeks before it was discovered and the ECU wasn't tellin me jack. Try that one if you've got nothin else to try

[NISTECH]

check your wiring to your maf for good ground, there are several threads in here covering that. try a search for MAF as well as coolant temp connector.