86 4.3 problems
 

The other night my car was idling high after starting and driving. I shut it off and now it don't start. I replaced the fuel pump relay and the fuel pump, still nothing. What else could it be?

Not that familiar with the early TBI system but as in any engine you need to check 2 things: are you getting spark and are you getting fuel. Sounds like you fixed fuel issues but if you aren't getting fuel into the engine it could be as simple as a plugged filter or else a problem with the TBI. I would check spark first, get a HEI spark tester and check for spark at the plug. On my 1987 I had to replace ignition modules a few times as they go bad after a while and won't give any spark.

Have spark. No power to fuel pump relay.

have you checked fuel pressure?

fuel pump run when the the key is on?

We ran power to the relay and pump kicked right on.

What powers that relay?