87 tbi 350 popping at idle and running rich

[devildogcummins]

Tested fuel pressure last week, key on 11psi before fuel filter and 11 at idle. changed egr valve and the popping has stopped at idle, if i give it a small rev it will pop out left exhaust still for 10-15 seconds, then idles smooth. still no codes. Have looked everywhere for a egr solenoid, but cant find one anywhere, mine is a 3 wire plug with a filter.

 

[gmbellew]

were the EGR passages clear in the intake manifold? are you sure the EGR valve is the correct type? there are positive answers negative backpressure valves. they look very similar, but they are not interchangeable.

you can test the EGR solenoid with a mityvac easy enough