Original post here: https://board.moparts.org/ubbthreads/show...e=3#Post5116478

Thanks to some good leads, I discovered my Mitsubishi-built Colt's ECU has been internally damaged by a leaking capacitor. In my research on this subject, I found out that many Chrysler vehicles have been plagued by this issue, including the Dodge Stealth. Some of my info came from Stealth/3000GT forums and sites, in fact. Here's one: http://www.stealth316.com/2-ecmremoval.htm
Although the exact years affected aren't written in stone, it appears that we're talking late-80's to early- or mid-90's. I'm passing this along in case it helps others track down any strange problems, including intermittent driveability issues.

I just ordered some caps for my ECU today, the obvious bad one plus 3 others as a precaution - caps are cheap! I have some board repair to do because of the corrosion damage, but hopefully this will take care of the injector problem. I'll post a few pics here. First one shows the offending cap at center. Orientation: left side is "up" in vehicle, so the leaking electrolyte ran to the right in picture ("down").

Missed attachment on last post

More corrosion further to right, where ECU connector pins meet PCB.

Bad cap and location where removed.

Better view of corrosion after removing 2 of the bright green caps seen in previous pic. (Had to remove to get to PCB for cleaning - the juice ran right around/ underneath them.) Black devices mounted to heatsink in background are injector driver transistors. Note the corrosion at their legs.

Better view of corrosion at connector pins after removing heat sink. Nasty!