I put octane booster in the tank when i filled it up, after that, the car idles really rough and feels like it is going to stall out on me when i stop, does any one know what the problem might be, i know im not putting it in the car again.

 

Stock car..... just use the cheap gas, spending extra for higher octane or on octane booster..... does nothing for you except waste your money.

I doubt its the octane booster making your car idle funny. If its realllll bad, drain the gas out and take it as a lesson learned. Other then that, just let it burn out and next time you fill up sees if that corrects the issues.

 

tbi is not designed to run on high octane

 

i put some in at the beginning of the summer and it did the same thing, but i adjusted the timing since then and thought that i might have been that, and i thought i would try some octane booster again but it just did the same thing.

 

Well dont search for power where their is none

 

putting High octane in a car that isn't tuned for it can actualy be a bad idea. Depending on your timing, etc. it may not burn fully and you may actualy lose power. I advanced my timing to 8* and then I needed higher octane ( GA summer heat contributes too). before that 87 worked best.

 

so you are saying if i choose to run higher octane fuel in my car, i would have to change the timing for it to run right? Not that i am going to do that, but i didnt know that the higher octane would affect that.

 

Yes, or get upgrades that need higher octane.
But like I said, the people with stock cars who advance their timing a ton and run on premium...... I doubt they get that much more power from that.
I wouldent think it was worth the tiny amount of extra performance you would get. The price difference between 87 and premium alone could pay for a new cam after a years worth of gas I say.

So just run 87 til you can get mods for your engine. Once it starts giving you knock go up to 89, still getting knock, then go to premium.

 

Using a higher octane gas will neither make you lose nor gain power. All it does is allow you to adjust your timing higher to avoid denotation.

 

If you're set on an "octane booster" just buy a gallon of 110 race gas and add a quart at a time to really get any real change in octane. The only change these over the counter boosters give you is maybe a "point" of a boost. Like going form 91 to 91.2. So there really is no differance. But I would listen to what everybody else has said and just run the regular stuff if you're stock.