I have a 1989 Concerto with a fully stock D16Z2 engine it, with no modifications to the car at all.

The other day, it decided not to start. as far as I could tell then, it was the distributor cap, which I replaced. However, now, the car will start, but only if I short out the clip for adjusting the ignition timing. When the car does start, it will idle fine, and rev fine if you gently ease the throttle, but any more than a quarter throttle causes the car to stall.

This happens with both the new and old distributor cap. The battery is fine, all cylinders spark fine. All the injectors are injecting fine.

Anyone have any ideas??