acceleration hesitation

Do you have a Check Engine Light coming on? If so, start there. Fuel system cleaning is more of a maintenance issue rather than a repair issue. It sounds like you need a repair. The code from the Check Engine Light is a much more effective way to begin to determine what the problem is.

95 buick lesabre; when hot hesitation on accelaration. I've replaced EGR, crankshaft sensor, fuel pressure reg., still trouble nothing changes performance HELP

Sounds like one of the module factory recalls. Call your Chrysler dealer, it doesn't cost anything to have this repaired and it sounds like your problem.