I have an 89 camaro v6 with a 2.8l n a manual trans. It all started awhile ago I filled my car up with 87 gas like I always have and after that my car started hesitating, like I would give it gas and thn it would go and then all of a sudden just like pause and then shoot forward again and sumtimes I would hear a popping sound after the pause and it shooting forward again. So I thought it was bad gas so I got some sum stuff that is supposed to clean out the fuel system and I filled the car with 91. That did not work. So I decided to change the spark plugs and the fuel filter. After that I continued to use 91 gas and the car seemed to be running good but I noticed that when I would floor the gas pedal or give it a lot of gas all of a sudden to speed up the cars rpms would shoot way up and the car seemed slow to speed up as if I had the clutch pushed down as I gave it gas. Other than that the car was running good until 2day I was driving and needed gas and I didn't have enough money to fill up with 91 so I put a couple gallons of 87 and now my car is back to the hesitating like back in the begining. I have no idea what to do now, does anyone have any ideas?
Thanx

 

Check your throttle position sensor, you might have one or more bad spots in it. You also might want to check the wiring to it, make sure it's not grounding/shorting to something.