:icon_ doh:I have a 95 blazer with the 4.3 vortec and when u start it, it runs like you have the gas to the floor, ive replaced the tps and idle control valve and egr valve, plugs and wires, and the coolant temp switch whats next??

 

Finding the source of your large vacuum leak should be high on the list.

 

ok found a vaccum leak and it didnt help. i scanned it and it reads- tps circut A low input...??????

 

Try disconnecting the choke maybe its shot

 

When you replaced the IAC, did you clean the port it sits in? I pulled mine a few days ago and it fell out in 3 pieces. Put it all back together and cleaned the sensor and the whole and mine quit idling at 3k. Also may try cleaning the contacts on all the connectors to the sensors in the area (map, iac, tps, ...) Also found a nice little leak on the vacuum canister while replacing the lines. Looks like the last owner broke off the nipple and shoved it back in there with some chewing gum...