Hard shift from 1st to 2nd and more

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I have a question, new thing just happen today. I feel it’s when I’m shifting from 2nd to 3rd and driving easy I get a RPM drop right at the shift. Drops to around mid 500 rpm’s and then corrects itself. Throttle body has new gaskets and a new position sensor installed a few weeks back and has been fine. Only happens at the shift.
Sounds like TPS. What tps was installed - OEM or aftermarket? If aftermarket that’s probably the problem - they’re all garbage.
 

pauly1119

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Sounds like TPS. What tps was installed - OEM or aftermarket? If aftermarket that’s probably the problem - they’re all garbage.
I can’t find a AC Delco one. I installed a duralast one but I ordered a Dorman one today thinking the same thing. Evidently mine is a fairly rare version. It’s 2001 and it’s electronic. It’s supposed to be here in 2 days so I guess I’ll see.
 

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