Ok, my truck barely wants to accelerate, and it has a random pattern for shifting into 2nd/3rd and doesn't exceed 60 mph or 2000 rpm.

I had my transmission rebuilt in feb. so i'm not sure if it's the OD gear problem I had, because this random shifting thing is totally different than my last problem.

Now I have had a problem with my cat being not so great, and wondering if finally it has indeed clogged up enough to not function properly.

Also wonder if it may be related to the TPS.

Well I will research through here, but if anyone has some up front info, let me know. thanks.