Couple of things. I have a 1979 Pontiac Firebird with a 3.8 liter v6 231 cid. This car was built in Van Nuys and has the california Emissions High altitude Non Air system in it. I am having running issues. The car runs fine then suddenly cuts out or bogs immediately at times when throttle is hit. This problem is intermittent and all fuel system items have been replaced from tank to carb. I am currently attempting to rebuild the emissions system in hopes that it could be the failure. However I have run into the problem of not being able to locat parts needed. Mainly my issue lyes in 2 parts The Distributor System/ Vacuum Modulator Valve (DS/ VMV) PN- 560694 and the Thermal Vacuum switch 3 Port intake mounted PN-3042272. I found a matching PN to 560694 through autozone however it was to a 2 port intake mounting thermal vacuum swithch and the DS/VMV of which i speak is a free floating cylindrical valve with three ports which sits on the drivers side bank of intake between the carb and valve covers. Any advice or tricks would be helpfull. Thx.