Performance issue
 

My problem started when this brutal winter weather hit (surprise). I think my fuel lines had froze so when I'd be riding, my blazer would sputter until it just shut off or as soon as it was started and sputter for a few feet and die odd. They thawed, everything was ok other than the random misfires so I went about cleaning the MAF, injectors, air filter all the logical things. Even went as far as replacing the distributor, cap, rotor, cps. I'm suspecting that I've either got a clogged cat or a bad fuel filter/pump. Not really sure how else to explain my issue but I'm sure yall know what I'm talking about. Random misfires. I changed out every O2 sensor a few months back as well. I'd appreciate any advice.

Need to know year, make, model, engine, trans, and if it is 2WD or 4WD.

You mentioned replacing the "cps", are you referring to the crankshaft position sensor?

When was the last tune up using AC Delco parts?
Have you checked the fuel filter for a restriction?

Have you checked fuel pressure and leakdown?

Does the check engine light work?

Is the check engine light on or flashing while driving?

Are there any DTC's in memory?

We need to know the answers to these questions to help you.