I have 95 Pontiac Transport with a 3.8L.. The problem is the idle goes up and down at idle and when coming to a stop, you need a ft on brakes and ft on gas to keep it running while driving. I have codes p0341, p1640, & p1670. The 341 is a cam sensor code. I talk to a Pontiac mechanic said to check to make sure the magnet is still on the cam behind the sensor which it is. I was messing around with the vacuum lines and took off the 1 that goes from transmission to the vacuum t. It ran great no stalling, but I know I need that trans line hooked up. Can I have a vacuum problem? Could it be something with the canister purge valve? Can you help me out with what it could be and what I should do?
RepairPal Certified shops can diagnose and repair your 1995 Pontiac Trans Sport. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
