1970 Datsun 240Z — rough idle disappears just above idle speed

Checked the easy stuff on the 1970 Datsun 240Z and found one clue worth chasing before I book a shop. Heat soak after errands is the other window.

Log the conditions before you spend. Move a coil or plug on the 1970 Datsun 240Z if it's cylinder-specific and see whether the code follows. That's the branch I'd chase this week. On “rough idle disappears just above idle speed,” that was the fork that mattered for me. I'd want that in writing, not as a promise. This is the filter I use when the thread starts repeating itself. That's my plan before I call anyone.

Start with the test that can prove you wrong. A pressure test beats staring at a dry driveway if the 1970 Datsun 240Z is losing coolant with no puddle. That's the branch I'd chase this week. This is from a 1970 Datsun 240Z in Nationwide. That's the whole play. That's my plan before I call anyone.