First off want to say hello to all blazer fans.... I've had my 02 blazer since 07 and I'm second owner. Love this truck sincerely own.. Been having troubles through and been scratching my head and few others and can't figured it out.. So I'll just start.. For some years if it rained and good amount over night it wont start and just crank. I've deal with this and this isn't the problem. About a month ago it rain and I worked to get it started and dried out. As I was attempted to start it it ran backwards a couple times and then started up normal like nothing wrong. I let it warm up and started down the road. I got to the freeway (which about a mile away) I pushed the throttle down halfway of better and it started bucking, back firing and complete lose of power.I let up on the throttle and it took back off.. Seems like anything passed halfway itloses power and bogs down. It gets worst and better and worst. Couple times could drive it at all and then it got better enough to drive home.. It act like a clogged cat which there is no cats on it. It acts like it starved for fuel but fuel test says it in specs and I think it loses spark which all plugs do skip a pluse now and again.. I've tested the battery, alt, and many sensors. Replace cap, rotor, plugs, distributor, tps and clean off all wires. There's more I've done but just see I anyone has had this problem. Thanks in advance

 

did you replace with A/C Delco or after market? could be bad wire or coil do you have any codes ?

 

I had both after market and original factory off a running low miles blazer. I've changed cap and rotor with three different ones and I've replace the coil and no difference.. I have a few codes that come up but none that I can't explain why they show up.. Like o2 sensor cause after the cat has been deleted and so on but no odd
codes that explains why it doing this.

 

try getting a squirt bottle full of water and start spraying down random spots on the motor around the distributor, wiring harness, etc. we do that all the time, you could have a wire touching metal or something along those liness