Need a little help I have a 190 E 2.6 it’s an 89 ok so here’s the problem On cold start it usually starts 1st turn but It starts revs to about 1k then drops down to under 500 rpm and sputters a little when it warms up its fine I have a few ideas #1 being vacuum line but not totally sure where to start. The other thing I was thinking was moisture in the distributor cap it’s a little off but I am going through any thing I can think of any help on this would be great thank you