I have a 1996 blazer 4x4 with a 4.3l engine. It will sit and idle fine but when I put it in gear it doesn't have very much power. I have changed all 4 o2 sensors, mass airflow sensor, spark plugs and wires, distributor, rotor, camshaft positioning sensor,coolant temp. sensor, map sensor, fuel filter and i took the catalytic converter off but I still have no power. Does anyone have any suggestions?

 

i'd check compression on all six cylinders. the middle plug on drivers side is a real bear. get a spark plug wrench , it has a t-handle and swivel real close to the socket. . you turn it like 1/6 turn, pull it off, move it and then another 1/6 th turn, and so on. also , use a plug wire puller, those boots are in there pretty deep you'll get it. you can borrow a tester at auto-zone. also, check for stored codes , auto-zone again can read them for free. also, note the condition of the plugs, keep track of which cylinder they come out of.