Engine Stalls

The neutral safety switch acts up sometimes too.

The NSS is gonna be a starting issue, Dies out could be an ignition switch failing, coil, and ignitor.

Check the fuel pressure to rule out the pump-CTS and ignition switch good place to start

The ECT/TPS/MAF sensor when defective will cause stalling-check the ECT resistances cold and hot. Try fixing it then retry and comeback we still got a long way to go to find this critter.

Have you ever change the oxygen sensor?

The coolant sensor monitors engine temperature. The PCM uses this information to regulate a wide variety of ignition, fuel and emission control functions. When the engine is cold, for example, the fuel mixture needs to be richer to improve drivability. Once the engine reaches a certain temperature, the PCM starts using the signal from the O2 sensor to vary the fuel mixture. This is called "closed loop" operation, and it is necessary to keep emissions to a minimum.

Also might want to bypass the ignition switch to rule it out by taking a wire from the battery positive post to the coil positive terminal this will power the ignition without the help of the igniton switch. The only time you need the switch is to engage the starter that's all. And see what happens. This don't work check the other sensors.

Good LUck

Hi there

Check for any fault codes, (codes can be set without the check light coming on) check fuel flow and pressure, check ignition on oscilloscope for faulty ignition pattens. Check ignition timing and valve timing, vacuum leaks and valve clearances.

Mark (mhpautos)

Get the idle air control valve, throttle position and mass airflow sensors to include the PCV and EGR valves checked out-also check the fuel pressure

The items I've mentioned earlier will affect your idle and cause the engine to stall or run rough

Lets start with the airflow meter and the throttle position sensor then get back with me for more assistance

BTW is this a Carb or an EFI system?

Hi Gary,

Thank you for the donation.

Did you check the spark plug conditions? Are they burning rich ( sooty) or lean ( whitish )?

Is the Check Engine light indicating?

I would suggest getting the MAF cleaned and retesting.

Duplicate the problem and do below to determine if its fuel or spark that's causing it.

Disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, cap and rotor /distributor pick-up coil, ignition control module, ECM, Ignitor cam and crank sensors- Note: If it doesn't apply disregard it

Lets start by having the coolant temperature sensor check-this done check out the idle air control valve and throttle position sensor. These 3 checks out -have the fuel system pressure checked and comeback with the results so we can go on to the next phase