Shop owner in Reno told me to quit guessing and buy a $40 vacuum gauge, best money I spent in 6 months
Kept throwing parts at a rough idle on a 2011 Silverado and got nowhere for 2 months, so I finally hooked up the gauge and found a leaking intake gasket in about 10 minutes. Anybody else got a cheap tool that ended up saving them a bunch of wasted time?