loss of power overheating issues HELP

[lathe2nd]

ok, new fuel filter, new plugs... only code it's pulling is the 0300 for engine misfire. it is running smooth at idle revs up a little better to 2300 rpm them bogs down if i push it beyond 2300rpm it will stall. tomorrow i am going to test the cat for being plugged by removing the o2 sensor and running it a little with the purpose mage exhaust leak and see if it runs better... if not anyone looking for parts? i've also got a 94 sls as well.

[Ranger]

tomorrow i am going to test the cat for being plugged by removing the o2 sensor and running it a little with the purpose mage exhaust leak and see if it runs better.

I'm not sure if that will work. You could remove the O2 sensor and install an exhaust back pressure gauge or disconnect the exhaust prior to the CAT and see it if runs any better.

[lathe2nd]

Hi guys! Great news... it's been a busy summer but I finally had time to work on the caddy...
I disconnected the cat and tried to run it with open exhaust to see if it would run any better - turned out that what it was!

Fortunately I live in western PA where we don't have emissions testing, so I took the cat out used a pipe to smash out the honeycomb - with a new gasket, bolts, 2 clamps and a coupler from advance, I'm back on the road for $12.00
Even better 28 - 29 mpg on the highway if I drive the speed limit on level road... but thats not easy to do in an ETC, lol

Thanks to all of you for your suggestions.