My 94 taurus has a problem with acceleration, it does not have any power it will not make it over 35 mph there is a hissing noise when i push the gas all the way to the floor still no power. but my rpms will rev it seems to shift just fine my new trann has about 20k on it my fluid is proper level and it is clear looking . i smell gas everytime i stop or turn car off and there is a loud rattling noise. any ideas???

i suggest try running a can of Seafoam through the vacuum line that goes to the power brake booster. use the whole can and if it stalls the car out loading it in there don't panic that's normal when and if it does put the power brake booster vacuum line back in the booster where it goes and put the remaining seafoam if any in the gas tank. the car will smoke heavily until everything is blown out of the car but pay close attention while it's doing so to make sure there is not smoke coming out of anything in the engine compartment if there is then something is leaking if nothing else is keep lightly reving the engine until the smoke stops and you should notice a HUGE difference in the way the car runs i suggest try running a can of Seafoam through the vacuum line that goes to the power brake booster. use the whole can and if it stalls the car out loading it in there don't panic that's normal when and if it does put the power brake booster vacuum line back in the booster where it goes and put the remaining seafoam if any in the gas tank. the car will smoke heavily until everything is blown out of the car but pay close attention while it's doing so to make sure there is not smoke coming out of anything in the engine compartment if there is then something is leaking if nothing else is keep lightly reving the engine until the smoke stops and you should notice a HUGE difference in the way the car runs