Problem solved. It was the ECU.

Pulling the harness apart is about the only thing that I haven't done. On this model the wiring goes straight from the ECU to the injector so if it was a short it would be a bad wire or wires as it's doing it on 4 out of 5 cylinders. #1 is the only one that is steady. I'll pull it apart and check th...

I'm not thinking it's the injectors. They all ohm'd great. It seems to be the signal that's the issue. A high impedance injector usually ohm's out at 12 to 16 ohms. Pretty much all regular injectors are high impedance (Saturated). Low impedance injectors are usually used in racing apps with aftermar...

It has solid voltage to the injectors. All of the injectors ohm out perfect, 15.4-15.6. As I unplug the injectors it seems as though the signal jumps around. Number 1 seems to fire consistently but the others don't. For example, if I check number 4 it won't be firing, then if I unplug 5 and 3 then n...

I only see the MAP sensor and the fan relays there. There is a relay in the kidney shaped main fuse panel that has a relay for the injectors.

Has anyone ever had an issue with erratic injector pulse? When I start the vehicle it runs smooth and within 5 seconds it starts running like it has a misfire. The MAF signal was only changing between 1.50 and 2.50 with engine revving and running rich fouling the plugs. I changed the MAF. Now the va...