Ok, so recently i washed my 1988 corvette because it was nasty dirty. Well washing it I also sprayed the gas cap area down with high pressure water. I did not think anything of it till the other day i started it up to move it, well when i reved it up it would backfire at like 3000-3500 rpm's. Could this be because I got water in the gas tank and if so how big of problem could I be facing here.

Well i doubt it, but if you think thats an issue then drain the tank and refill it with new fuel.

Ive hosed in there every time i wash the car and havent had that issue yet!!

ok im just checking. im not driving the car cause i have to do work on it before it is driveable but sometimes i like to go to it start it up and rev it up. but yeah it was back fireing around 3500 RPM's its not the opti i dont think so atleast cause i didnt spray down the engine. ill start it up tomorrow cause i need to take it to my new house and give it another rev up. and see

Well i know for a 190% fact its not the optispark cause you dont have one.

oh lol. good point. i wasnt sure everyone is always talking about there opti so i figured i did have one. what is it anyways well were on that subject.

Optical triger system in the distributor on the 92-96 LT1 and LT4.

Despite the rumours, washing the engine wont hurt it either as long as youre smart about it, cause mine is still going strong.

so wait why dosent my distributor have one?

Cause yours is 88, and its an L98, has a conventional distributor

aw ok. im just getting into the engine technical stuff. i know the basics of the engine and i know how it works.

Like Case said, I doubt if you got water in the tank but a cheap cure would be to put a couple bottles of Heet in the tank, it will help get rid of the water if there is any.