Problem solved - exhaust restriction caused by failed catalytic converters. The only codes that were thorn were random misfires and the Jeep Dealer told me that there was not a problem with exhaust back pressure, sending me on a wild goose chase.
1st: cleaned the throttle body and replaced the TPS - no improvement
2nd: replaced the spark plugs and all eight coils - no improvement
3ed: replaced the fuel filter/regulator - no improvement
4th: replaced the fuel pump(complete unit) - no improvement
5th: replaced the Y pipe that (contains 2 cats) connects to the exhaust manifolds and replaced the third cat - problem solved
I don't know how the dealer tested the exhaust pressure but a simple solution, if you suspect a problem with restricted exhaust, is to disconnect the exhaust at the headers. If it then runs like a bat out of hell when the gas peddle is stomped, you have located the problem.
A thank you to the Jeep Garage folks for the help.