Replaced the plenum on my son's 99 ram last weekend. no issues with the intake removal and repair. start the truck, and it idled fine for about 10 seconds, then stumbled and died. restarted, dies at idle. If you you keep rpm it it will run, but as soon as it returns to idle, it dies. pulled throttle body from running truck, swapped it on, including IAC, MAP, and TPS from running truck. truck starts up, runs great. then we realized that we had left the vacuum line off the brake booster. plugged it up, truck immediately dies. pulled vacuum line back off, truck starts and runs fine. put finger over vacuum line to stop the vacuum leak and the truck dies.

I'm at a loss.....any suggestions.