Crappy acceleration

[Chevyboy252]

I just bought a 95 Na 2+2. The guy I bought it from said this problem started out of nowhere , I bought the car because I thought the cats were stopped up. I drove the car yesterday when taking off I have to rev really high just to get it moving (5 speed) once in gear it accelerate very slow. The car shift fine but won't go over 45 mph ,when coming to a stop and letting off the gas the car cuts off (will start back up) any help please ???

[MarkerZ32]

None of this is in order. Check ECU for codes. Air + Fuel + Spark. Look for any intake/EGR/vacuum leaks, check fuel pressure, check fuel pressure regulator and dampener diaphragms, check spark plugs, ohm test fuel injectors, check all harness connectors and grounds, verify correct reference values from MAF, TPS, CAS, and both heated oxygen sensors, verify correct ignition and physical cam/crank timing, set base idle speed, try running test pipes in place of CATs to verify exhaust flow.

There is a lot of very useful information here which helped me more times than I care to count:
http://z32.wikispaces.com/

Good luck and welcome to the forum!

[rgregoryb]

First step: run the ECU codes. Google is your friend

[evildky]

The stall when decelerating is likely the iacv, most likely just needs cleaning.

[DCaff300ZX]

The stall when decelerating is likely the iacv, most likely just needs cleaning.

Good call, cleaning it with a few shots of WD40 and if no success, removal and best powerclean/new gasket and that failing, probable NEW replacement (don't buy used) and also an inspection/replacement of the two connectors, and also check the hoses leading to and from it for cracks and splits.