I have a 89 blazer tbi. when i drive slow it runs fine and it idles perfect but when i get on the gas it has bad hesitation and sounds like its going to backfire cant even get over 55mph. it seems like a fuel issue to me i replaced the fuel pump fuel filter rebuilt the throttle body and cleaned the injectors but still does it.

im thinking now it could be the timing is off or the o2 sensors. i took them off when i made my exhaust and never put the o2 back in and thinking maybe the ecm is reading a bad air/fuel ratio so its telling the ecm the wrong amount of fuel to let in.

jus my thoughts what do you guys think im stuck

 

Anybody?