1989 420 SEL

[SkippyT23]

OK, a week ago upon acceleration under load semi-aggressive it started breaking up and had to feather. It continued and under light acceleration it would be ok, but if you turn on the a/c it would break up heavily, obviously I turned it off. Went to Bank came out car would not start but tried to almost like a dead battery.
Towed to shop, mechanic says new battery and works fine now that was the problem. NOT!!
Same day i got it back from mechanic it started breaking up a little again. I took it home and did not drive for two days...
Car started yesterday evening just fine, went to store, came out and had trouble starting so I went directly home, turned it off and tried immediate re-start... would not start.... Next morning started fine.

So seems like when its hot it doesn't start, and that just running drains the battery system, and a/c makes it break-up (probably again takes to much power from battery system).

Does this sounds like a coil issue? Fuel Relay/Pump....? Rotor/Cap/Plugs/Wires?


FYI - The Problem was the Voltage Regulator on the Alternator - also 9/10 times its this and not the alternator itself...

Help!!
Lance - AKA "Skippy T"