Chevrolet Repair: 1992 K-1500 Blazer 5.7L automatic, 130k, vacuum leaks, fuel pump filter

Question
Mark-
Starts up easily and idles smoothly. Runs powerfully for a block or two then hesitation until it warms up to 150 degrees. Gets worse with colder weather. Recently installed sparkplugs, wires, TPS, CTS, MAP,EGR solenoid, ECM, fuel pump, filter, ignition module, injectors and TBI shop cleaned. Checked for vacuum leaks on hoses and replaced any that were loose. Runs great after warm up.

Answer
Hi Rick, Not sure what to say on this one but try this...Disconnect the egr vacuum hose and see if that makes a difference. Next if you don't have a scan tool, disconnect the o2 sensor and see if that helps. Be sure that the engine timing is set correctly with the timing connector disconnected.

Let me know what happens

Have a Nice Day             Mark