93 GXE all maintanence done on schedual by previous owner, I bought it not to long ago and the first 2 tanks of gas I used reg (octane 87 to 90), car ran fine.

I have switched to mid grade because I wanted to do something nice for my Max(octane 90 to 91) and now I get a hesitation if I push the accelerator just a little?????

If I accelerate quickly it is Ok but for driving around town that stumble sucks.

Could the higher octane be causing the hesitation?

 

try adding a bottle of fuel injector cleaner next fill up.

 

I'll do that, I have changed the fuel filter and the air filter but is there any particular injector cleaner that is better to use with the SOHC

 

Why not switch back to regular....there have lots of studies that prove that high octane fuel offers no performance or cleaning benefits. Unless you have increased the compression ratio or your vechile "knocks" with regular I'd stick with it. I've run both in my cars and honestly can't tell the difference performance or mileage wise.

 

i use chevrons techron concerntrate fuel injector cleaner and fill up with 92 octane of chevron

 

may be a slowly dieing MAF sensor or O2 sensor, they bring that same crapy hesitaion when accelerating gfrom slower speeds

- it could be alot of things
-let us now how it turns out