A car running rough can be tricky to diagnose. On this episode, we reveal a common source of faults that can cause a rough idle or at times a stalling condition, and how to easily diagnose utilizing a smoke tester.

Great Smoke Tester if you will be testing many vehicles (Professional Use):

Smoke tester (inexpensive):

Be extra cautious if you are going to utilize a carburetor spray to isolate vacuum leaks (very flammable).

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