under the driver's seat in the engine compartment/ under the car, there is a braided cable bolted between the body and the engine. remove it, clean it and where it mounts, put it back well. this will ground the engine and it's components to the body. do the same to the negative cable from the battery to the body. I like to then take a long braided cable and attach it under the battery cable from the body to the motor I use the intake manifold, as it's aluminum, and clean.
as for the stalling, check the usual suspects, fuel filters, idle speed, air filter, chain stretch, valve clearances, and throttle linkage.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!