Weird vibration only between 62–70 mph

Log the conditions before you spend. Write temp, speed, and in-gear vs coast when the 1968 Ford Mustang does it — then decide on parts. That's the branch I'd chase this week. On “weird vibration only between 62–70 mph,” that was the fork that mattered for me. This is from a 1968 Ford Mustang in New York. Verbal 'we'll take care of it' is not a plan. Climate here is different, so treat that as a local data point. Trying not to diagnose from the couch.

Start with the test that can prove you wrong. Two 1968 Ford Mustangs can feel identical and have different causes, so measure before you copy someone else's repair. That's the branch I'd chase this week. Write the result down so the next test isn't a repeat of the last one. If that fails I'll eat the diagnostic fee.

This is usually cheaper to test than to guess. Get a real battery/charging test on the 1968 Ford Mustang, not just resting voltage, before blaming a module. If the cheap test changes it, stop and reassess. I'd want that in writing, not as a promise. I'm in no rush to be a hero on it.

If it were in my driveway, if a shop can't duplicate it on the 1968 Ford Mustang, bring a video plus freeze-frame data, not just a story. If the cheap test changes it, stop and reassess. Not gospel, but it saved me a headache. I'd rather be boring and correct. If this is nothing, great. I want that in data.

Checked the easy stuff on the 1968 Ford Mustang and found one clue worth chasing before I book a shop. That's my plan before I call anyone.

Start with the test that can prove you wrong. Capture voltage while the 1968 Ford Mustang is actually failing — after it restarts you've lost the clue. You'll know quickly if you're on the wrong tree. Time, temperature, and whether it's in gear are the notes that actually help a shop. Worth doing even if the car feels fine right now. Cold start is when I can actually reproduce it.

OP update: scanned the 1968 Ford Mustang again and still only have the one pending code, no new lights. If it repeats twice more I'll book time.

If it were in my driveway, move a coil or plug on the 1968 Ford Mustang if it's cylinder-specific and see whether the code follows. Don't erase codes until someone who can help has seen them. Keep sale price, fees, and rate as three different conversations. I'd rather be boring and correct. I refuse to clear codes until someone else sees them.

I wouldn't throw parts yet. Capture voltage while the 1968 Ford Mustang is actually failing — after it restarts you've lost the clue. That's the branch I'd chase this week. I'd want that in writing, not as a promise. Your commute and mine probably aren't the same, but the test still applies. That's my plan before I call anyone.

It did weird vibration only between 62–70 mph twice this week, both times after sitting. No change in mileage feel. I'd rather look cautious in this thread than stuck later.

It did weird vibration only between 62–70 mph twice this week, both times after sitting. No change in mileage feel. I'm in no rush to be a hero on it.

This is usually cheaper to test than to guess. Swap the cheap/easy piece first on the 1968 Ford Mustang and see if the fault moves. Save the big job until that test fails. This is from a 1968 Ford Mustang in New York. Verbal 'we'll take care of it' is not a plan. Only after sitting overnight so far.

This is usually cheaper to test than to guess. Capture voltage while the 1968 Ford Mustang is actually failing — after it restarts you've lost the clue. You'll know quickly if you're on the wrong tree. Verbal 'we'll take care of it' is not a plan. That's coming from doing this as an owner, not a shop. I'm keeping receipts and dates in one folder.