87' motor dies a lot

[dc26132]

I just recently purchased an 87' that has been sitting up a while. Motor only has 3k miles on it. Fuel tanks are clean, new fuel pump & filter. I'm having issues with the truck staying running when I come to a complete stop or when going from reverse to drive or vice versa. Doesn't do it all the time. what should I start with first to diagnose this problem. New to these trucks but not new to chevrolets.

 

[Georgeb]

Does it restart right away? Any other sysmptoms? When switching from park to drive or reverse are you stepping on the brakes. What if you don't step on the brakes?

 

[dc26132]

No other symptoms & yes I'm stepping on the brakes. It does start right back up

 

[Georgeb]

I wonder if it is a vacuum issue. does it have a vacuum operated brake booster? You could drive it for a bit with the line to the booster plugged and see if the problem goes away. You won't have power brakes when you do this so bear that in mind.