'98 durango 5.2 runs like crap for a brief moment everytime

i have a '98 durango 4x4 5.2 v8 and heres my problem

i have a p0135 code, i just installed a glasspack on my '98 durango 5.2, the code came on a few days after i did the install, Now the problem that i want to get rid of has been happening before i even installed the glass pack, heres what happens everytime i start it up and go down the road a few miles then for a brief moment i loose power then she goes back to normal. Even when i start it up and let it idle, i dont touch the gas at all or put it in any gears after s few minutes like 1-2 minutes the idle gets crappy just for s brief moment like 5-10 seconds then goes away and idles fine. soo no matter if i drive it or even let it idle it runs like crap after a few minutes every time i start it up for a few seconds
PO135 02 sensor heater failure oxygen sensor heater malf
you could have a faulty 02 sensor on your truck its the one before
the converter if you got a ton of miles on it it would"nt
hurt to change it out thats a maintanance item anyway if you ask me
I second that. You want a 12 year old vehicle to run crappy, have a bad O2 sensor. It should've been tossed before this as scheduled maintenance and the problem wouldn't exist
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