Why is my 1995 chevy s10 2.2 surging and stalling when accelerating from a stop?

My s10 has 2.2 w/manual transmission and 180,000 miles. Truck starts up fine and sounds like it is running well until it reaches operating temperature then the RPM's start surging and it starts missing. If I try to accelerate when this is happening it will bog down and stall. I can get it to go If I press the gas pedal very slowly until it reaches higher RPM (4000) and drop the clutch. The surging may stop and the truck returns to normal then it starts surging again.If it stalls it will start right back up if I put the gas pedal to the floor when starting it.check engine light is ON but my OBD-2 reader powers up but fails to clear or read the codes when I plug it up to the truck.I changed the spark plugs and they seemed wet with gas but no excessive soot or gray . A new fuel tank,fuel filter and sending unit were installed 6 months ago.I thought it could be the EGR valve so I replaced it but problem persists.I checked for vacuum leaks with propane and do not hear any . Cat is not plugged. Could this be coil packs, MAF ,TPS, CPS, timing chain? I plan on doing a compression test tomorrow, if anyone has any info it would be greatly appreciated.