FIRST thing I'd do is verify the ground strap is on the block.
then, I'd loosen the ground cable from the battery to the body of the car, clean the cable, the bolt, the body mount, and then get a 40" or longer ground strap, and put it under the stock one, and connect the other side to the intake manifold somewhere. then drain the motor oil, and put in fresh synthetic oil. 5 W 40 rotella seems to be the lowest priced oil.
next, I'd pull all the glow plugs, as they are supposed to be around .6 ohms, not "just over 1.0" and replace them with a fresh set of BOSCH glow plugs.

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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 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!