HELP!!!!

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Have replaced coil, spark plugs, injectors, etc... You name it, it's probably been replaced. Horrible gas mileage, smells rich, rough idle, car will quit as a stop sign, within the first 7 mins of starting (idle), it will shut off. Help!!!noone can seem to figure out the problem and I am very frustrated with having to spend money that is not actually needed. I could have purchased a new engine for as much money I have put into "fixing" the problem that still exists. *****dealers comments: the compression test # 6 cylinder is low & performed an actual compression test, #4 200 psi, #5 195 psi, #6 85 psi and performed a cylinder leakage test on #6, it has 80 psi leakage out of the exhaust, removed the valve cover & inspected the springs, they are in good shape, reassembled and gave back to me. Not sure what to do next... all costing money for each and every person to tell me nothing is wrong...