E420 running poorly

[Quick4door]

I recently bought a 1995 e420 from a friend that ran but needed a wiring harness. I installed the harness that came with it and it ran great but shortly after idling for about 10 mins it started misfiring and finally died. Was running well last year before it was parked. Swapped ecu, ignition module, plugs. No chamge (all 4.2 specific). Pulled the caps and rotors, slight moisture. Newer beru, added vents per another post. Haven’t installed them yet, that comes tonight. If that doesn’t fix it, I’m going to check fuel pressure. Any other suggestions? No codes with my SDS come up via the 38 pin connector. I am able to scan the LH module, it says no codes present with either ECU (swapped from my 400e). Any suggestions on where to go? I can swap the maf and or the throttle body if needed, just no clues to say they are failing.

Thanks in advance!

 

[Alphasud40]

Go ahead with the installation of the caps and rotors. From past experience if your caps and rotors have moisture and have been arcing you should replace them with OE parts. Also the insulator shields need to be replaced in conjunction with the other parts and inspect the camshaft seals for leaking. Your description of failure of running fine for 10 minutes and then stalling is classic textbook failure for issues with the caps and rotors. Also don’t overlook the coil wire connection at the ignition coils behind the drivers side headlight and under the ABS pump. Not as likely but I just had that happen to a car I am working on.