My son's 1993 del Sol, 1.5 liter injected engine, 180,000 miles, manual trans, has developed a problem where it will sometimes stall after a brief period of idling (like at a stop light). It will idle fine (around 800 RPM), but as soon as he puts it in gear and touches the gas pedal, it will immediately stall (no sputtering). Happens when the car is warmed up and seems to happen more often if the car is stopped facing uphill. It sometimes takes several attempts to re-start after this happens (fun in traffic!). Also, sometimes when shifting gears, there is a miss just as the gas pedal is touched while letting out the clutch, but it does not stall.

Recent (within the past 1000 miles) work done: rebuilt cylinder head, PCV valve, air filter, spark plugs, and main relay. He ran some StarTron in the last tank of gas, hoping it might be water in the fuel, but no change. The car runs fine otherwise, no Check Engine lights. This problem did not start immediately after any of the above services.

I have checked the TPS; output voltage is .49 closed, 4.98 open, with a smooth progression from closed to open.

Any ideas are appreciated.

 

How old are the spark plug wires, distributor cap, and rotor?

Has the fuel filter been replaced?