What would cause a 1999 Dodge Caravan 3L to lose power acceleration Have had it checked 3 times and mechanic can't figure it out?

There was a code that advised that there was a problem with the EGR Valve, which was replaced in Dec. Exhaust and tailpipe apparently are fine. Have had the fuel filter and pump assy replaced, catalytic converter, belt tensioner, serp.

And a/c belt and crank position sensor. The van still runs, but, feels that it is sluggish and I have to floor it just to get up a hill! Not being very familiar with the inside of vehicles, it is very frustrating.

The transmission has been checked twice, and apparently is fine. No oil leaks etc. The van does have a 157k km, so, would expect something to go wrong. This is just frustrating.

There does appear to be a slight hint of gas smell when the heater is on? Thank you.

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