Check for gas leak around fuel rail, fuel pressure regulator, fuel filter. Maybe a bad injector is causing the car to run bad. Maybe the chip isn't seated properly. If the car idles rough you can try wiggling wires at the ignition module, injectors, and ecm to see if a wire is bad. Check the ground wires. Easiest one is the wire from the battery to front of block. Our 30 y.o. wires are deteriorating. I replaced my whole engine harness and injector harness last January. For some reason my car was shutting off occasionally on wide left hand turns. Has never done it with new harness.