Hello,

I took my 89 G-20 cargo van to my favorite long time mechanic for a new flywheel and serpentine belt. After picking it up the next day I started it up and it sounded and drove terrible. I turned it around and brought it back. They took the dog cover off and said that they accidentally knocked two of the spark plug cables off of the distributor cap. Ok, no harm done. I started it up and although it was not as bad as it was it was still rough. I checked the firing order, changed the spark plugs, distributor cap and rotor but it sounds like it may be out of timing. I was wondering if the mechanic rotated the distributor and if so can I go back and rotate it back in position? The reason I suspect the mechanic is because I don't see how someone can knock two spark plug cables off of a distributor cap by removing a dog cover.

Thanks for the help. I use my Chevy for work and am proud to keep it on the road.

Jim

 

 

More than an inch in either direction and it would run at all. It could be a timing issue as Greenfire says.

 

I took it to a mechanic who has a similar vehicle, he put his timing light on it and it read zero. That is just what the manual recommends.
Thanks for the good advice,
Jim