Recently, my LT1 has developed a stumble or hesitation. It happens, but only periodically, off idle, I can floor it, an dit feels like I'm being held back by soemthing an dthen you can feel soem stumbling, then it accelerates noarmally. My car is stock aside from a Borla. I run 93 fuel. I have had 2 opinions, 1 saying it's the fuel filter needing to be changed, the other saying chnage your O2 sensor. Any help woul dbe appreciated.

 

When was the last time your spark plugs where changed?

 

To answer your question, I belive they were changed at least 3 years ago. I di dfail to mention, and I concentrated an dtook note of this. I got a rebuilt rear end in June. I stepped on it today leaving work and it feels as though the rear end gears are the culprit. It feels like they're binded up. I hear no pinging, no sound of anything ignition wise, but it sure feels as though it's soemthing in the rear end.