Jeep loss of power

[camsloop]

99 jeep grand cherokee, 107k , 4.7l awd. Here recently since its been getting cold, the jeep has a loss of power almost as if im towing a trailer or the engine has a load on it from 0-45 mostly.. During temp. over 40-50 deg. it seems to run normal. The airfilter/ throttle body is both clean. Ive ran 93 gas an 4oz of lucas fuel inj. cleaner an it seemed to barely help. Gas mileage has went down just a little bit but not tremendously. Possibly fuel injectors, engine temp or throttle body sensor, clogged cat, tune up? The jeep hasnt thrown any codes. Any advice? thanks, cam

 

[braxton357]

I'd bet clogged cat. Easiest would be pull the o2 sensor and see if it drives any better. You can also plug a vac/pressure gauge in before the cat and check backpressure while its running.