Joined: Feb 2008
You might have a C4 auto, and those I know have a vacuum sensor to determine shift points. If that sensor is ruptured, it could very well be enough to stall the motor. But also, try revving it in park or neutral. If it feels like there is a flat spot, there's most likely a vacuum leak anywhere in your vacuum system (power brakes, transmission, ignition). All the rubber hoses and possibly ignition can be checked by spraying them with starter fluid. It should rev up a little bit when you spray them.
Proud owner of a '65 289 coupe w/ T5. Equipped with Edelbrock Performer intake, Quick Fuel 680HR carb, flat-top pistons, Comp Cams Xtreme Energy valvetrain with XE262H cam, Hedman longtube headers, MSD ignition, and decked and ported heads. Suspended by 600# 1" drop front and stock rear springs, KYB shocks front, 1" front sway bar, 1" Shelby drop, Griggs Racing GR350 rear suspension. Many more mods to come!