The fuel injectors can fail and cause drivability problems. Often there is no Check Engine light and the failures can be caused by corrosion of the connector, clogging beyond the point of cleaning, and/or internal failures.Google+
Car Problem Reports
Nissan 300ZX Fuel Injectors May Fail and Cause Drivability Concerns
Nissan 300ZX Problem
Engines Affected: 3.0L V6, 3.0L V6 Turbo
Average Mileage: 151,545 mi (92,500 mi - 228,000 mi)
Visitor, 1990 Nissan 300ZX, 3.0L V6, 228,000 mi
difficult to start when cold.
Visitor, 1990 Nissan 300ZX, 3.0L V6, 167,228 mi
Engine was missing. Installed new fuel injector plugs and cleaned contacts of fuel injectors and now running on all cylinders again.
actually just bought my first 300zx. It's a bit of a mess and is running very rough. Just went through the plugs, found one coil pack was not plugged in and hoped that was the problem, but it's still running rough. No check engine light or any indicators. I assume a fuel injector problem but which one? need to buy a OBD1 scanner I think?