88 runs poorly cold

[jranger35]

My friend has an 88 with a new rebuilt engine (fuel-injected) and tranny. He just put the engine in a couple of months ago, it used to run great, but now there's some sort of problem when you start it cold. It starts jerking and dying, surging forward and then stalling until the engine gets over 190 degrees. Then it's fine. We're kinda lost on this one, and we have to get it fixed soon, because I'm afraid he's going to seize the engine up revving it so high when it's cold. Any ideas? Thanks!

 

[flyguync]

If your EGR valve opens before the engine gets warm, it can cause that type of problem. I'm no expert, but there should be some type of thermostatically controlled valve that interupts vacuum to the EGR valve until the engine reaches normal operating temperature. That valve may be opening too soon.