YukonGTmaster
Full Access Member
- Joined
- Mar 18, 2021
- Posts
- 525
- Reaction score
- 987
I was having a rough idle, and the Amber engine light would flash (Random misfire) when I started up in the morning. I would cycle the key off for ten seconds, the light would go out and I would drive to work. It was not latching any codes. I had a bad coolant leak as well. Then I started to hear a whistling sound, like a vacuum leak on the passenger side engine. I also had fouled/residue at plugs 4 & 6. I ordered parts: MPFI Spider from Motor Man, Felpro Gaskets P/N MS 98000 T, Felpro lower intake bolts P/N ES 72224, and Bravex Distributor. I disassembled...and was horrified what I saw. The coolant port at the lower intake manifold was extremely corroded and pitted at the gasket mating surface.