Idle drop while braking,backing out of driveway

[Scooterwrench]

I know P term and D term adjust how much the spark advance reacts to idle rpm changes, but I do not know what each one does. I would have to read up in the Holley tuning manual for that ECU. I have only messed with a couple of Holley systems over the years.

P term=Park?
D term=Drive?

 

[1994rcsbLS]

Bit late, sorry fellas.. so after I got the truck back( i sent it in for a 9" rear swap, with disk brakes ) had the shop while in the brake system change the master to the NBS, added stainless braided lines up front, abs deleted, and wilwood proportioning valve.. have to say, truck doesnt seem to want to stall anymore. im guessing with the old setup and brakes upgraded she doesnt need much vac to stop. so seems alright now.
Thanks for everyones help!

 

[Erik the Awful]

I sincerely hope you also changed to GMT800 brakes out at the wheels to match the master cylinder. There have been a handful of guys who've swapped in the master cylinder while keeping their stock brakes who've had lockup problems in emergency stops.

Brakes are one of those places where you really can't just swap stuff around without doing some math.

 

[1994rcsbLS]

I sincerely hope you also changed to GMT800 brakes out at the wheels to match the master cylinder. There have been a handful of guys who've swapped in the master cylinder while keeping their stock brakes who've had lockup problems in emergency stops.

Brakes are one of those places where you really can't just swap stuff around without doing some math.

I don’t drive it often, but… I’ll look into that! Assuming I have to change out the calipers and pads only right?

 

[Erik the Awful]

I myself haven't swapped to a newer cylinder. Normally if you upgrade to a GMT800 master, you'd want the GMT800 disc brakes all around. You mention that you did a rear disc swap. Where did your rear discs come from? Do you know the piston sizes?

BillaVista.com-Brake Basics Tech Article by BillaVista

 

[1994rcsbLS]

I myself haven't swapped to a newer cylinder. Normally if you upgrade to a GMT800 master, you'd want the GMT800 disc brakes all around. You mention that you did a rear disc swap. Where did your rear discs come from? Do you know the piston sizes?

BillaVista.com-Brake Basics Tech Article by BillaVista

My rear was built by quick performance and sent with the whole rear disk setup. So I’m not sure.

 

[Erik the Awful]

I'd email them and ask the piston size. Then determine which front calipers you have and get that piston size. Then figure out which GMT800 master cylinder you have (was there more than one?) and get its piston size. Math it out and ensure you're in a safe place.