general problems of the 1997 Jeep Wrangler

I have a 97 Jeep Wrangler. I have a problem everytime I start my Jeep after it sits for 20 min. It sounds like it wants to shut down and after pressing the gas to the floor it finally kicks in and takes off. I lose power alot and it backfires . I have had the exhaust manifold /catalytic converter replaced and a broken stud in the exhaust manifold to head assembly. This has been going on for 3 years and I have taken it to several differnt Jeep service department. All the service departments can tell me is that they can't find the problem but they always seem to find something else for me to pay for . I'm still having this problem and now it's getting worse . What can I do? please help.

Fuel gauge quit working, consumer noticed a fuel level sending unit recall when on yahoo, after calling Chrysler, consumer was informed that vehicle was not included due to VIN. Consumer has ran out of gas several times resulting in two near accidents. Chrysler responded saying that they fixed the problem before the vehicles VIN was made.

While driving on the freeway vehicle began to smoke and there was no oil in the engine. Oil was leaking from the bottom of vehicle.