Quote Originally Posted by FordMan77 View Post
What type/brand of plugs did you install? Check to be sure you have no vacuum leaks anywhere. And a partially clogged cat can run fine when cold, then as it heats up it can choke the motor down. If you crawl under it and hit it you shouldn't hear anything rattling around in it. If you suspect a clogged cat you can also temp. remove the upstream O2 sensor and drive it for a short bit. Yes it will be loud and cause an exhaust leak but it usually relieves enough pressure to let the motor run properly if the cat is clogging.
OEM replacement wires with NGK TR55s I think were the plugs.

If that's the symptoms of a clogged cat, then I probably don't have a clogged cat. It doesn't matter if I've been driving 1 min or 50 it'll buck down the highway, any kind of slight incline while in OD or even an incline at low RPM at 20mph. Seems like any kind of low RPM at load gives it issues.

I'll get the codes checked today after work and write em down.