My Capri had 'stumble' problems for such a long time. The 'Stumble' was more like the car was struggling for gas or electricity (usually when accelerating). I read here, I think Russ said it was a ground wire problem. After reading the suggestion, I added another ground wire to the engine. It helped but, still the 'stumble'.
A couple of months, ago, my brakes were locking (up). I did my internet mechanical homework, most sites said my brake problem was the master cylinder. Lucky 'Rock' auto parts had the part, after receiving the new cylinder, I took the car to the car repair shop. A few days later, 'Tye', the mechanic calls me and tells me he cant bleed the brakes because the 'Brake pressure switch' is leaking.
Guess what? No one makes or sells these plastic switches. 'Tye' searches the local junk yards for 2 months, he cant find any suitable switches. I ask the mechanic if we can just plug it, but he tells me he cant because a different thread.
Lucky me, in 'Ebay', someone is selling a used complete MC for about $60. (sorry, Colin). My mechanic puts the ebay MC switch on the Rock auto MC body.
Guess what? the car runs great, no hesitations (or stumbles) when accelerating. me and my neighbors guess, is somehow the bad switch caused the electronics to falter? Also, the radio is not working, maybe a coincidence? Im happy to have a good running car, now, I'm not gong to even check the radio fuse.