Hello i have a 82 300sd with 318K miles.

Ok the symptoms ive been having are:

1. Rough starts. It starts easily enough but idle is rough and needs a higher rpm to smooth out for 5 sec or so. then the idle will still oscillate between 7-1000. Once it warms to Op temp the idle is fairly smooth.

2. once warm if i just tap the accelerator a tiny bit it will rev up 3K and pause for a second before slowly come back down(more than a normal rev, like my foot wont even be on the pedal and its climbing before a distinct pause and slow down) .

3. It also sometimes Revs up after driving around the block when i shift from Drive to park, revving up to 3k and slowly coming back down. Or its happened when ive idled for a couple minutes and turn it off(about scared me to death thinking it was a run away.) But these two symptoms don't occur together, its one or the other thus far.

I suspect these issues are the injection pump, and i am not looking forward to pulling that in this cold weather.

But please chime in if you've had previous experience or knowledge with these issues. I really need the car on the road again.