dirty fuel tank

[Jim & Michelle]

I'm the guy with all the problems with my sons 5KT.  It will idle decent now but misses when reved to the point of smothering out completely I'ved changed distributors, replaced some vaccume hoses replaced air hose at metering box, fuel filter, & fuel pump was changed before I aquired the car.  I decided to check the fuel filter for my own sake and found the filter screen to be covered with very fine particles of rust almost completely.  I'm assuming that could explain my rev problem ( I'm hoping anyway).  My question for you;  can I use brick acid to clean the rust from the tank, and then use a gas tank coating liquid to fix my rust problem?

Jim