Needing some Help,

I have a 2000 SS Camaro with an auto trans:
Car has:
SLP intake/Headers/LS6 intake/MAF/ comp cam 228-230/918 comp valve springs and Manley pushrods/ new rockers.

Long story short i had the car tuned a long while ago (12+years ago). It runs and drives ok. The issue i have is if I drive it normally I have zero shift issues. But if I'm at a light and open er up a bit it pulls and all is great. But once the car comes to a complete stop and i start driving it normally again the transmission shifts insanely and makes the car shake. From 1-2 and 2-3. only want to make this go back to smooth shifting is to pull over shut the car off for 20 seconds, Restart it and I'm back to normal. (Makes me think full line pressure all the time - not sure if faulty pressure reg in trans?

The original tuner (was new to the ls base tuning - i told him not to mess with the trans settings but looking through the tune (in HP Tuners) (and comparing it to what base tunes i could find on HPTUNERS looks like some parameters were adjusted).
and the Max line pressure DTC's P0101 + P0102 + P0103

When I initially had the car I went back to him a few times about the shifting and he's like its not the tune and its likely the shift solenoids. So i did replace those and no fix. I also replaced the TPS thinking that this maybe a possible fix to the issue as well. (added parameters of the car now)

Like got busy with work/getting married/kids - lost interest. But the kids are starting to peak so car interest so here I am.

I will be reading more posts on tuning and parameters on here and hope to come to some resolution.

Car is inside for winter as it never seen snow/salt. But trying to be ready.

Thank you in advance.

 

The most likely cause would be that when you "open er up", something is causing a MAF code to trip, which will automatically command full line pressure unless tuned otherwise. This is only speculation, however, without your tune and a log of the problem happening to look at.

 

10-4 thanks for the input send a PM.