5 miles to the gas station, fill-up with premium Chevron, as usual.
14 miles later, while cruising at 78 mph, I start to feel a vibration, like a tire out of balance, or going flat. I kick off the cruise, and the vibration stops. I easily mash(Alabama term) the accelerator petal, vibration returns. Several test accelerations, and the vibration is evident, under acceleration. Now I am scared.
I slow down, activate the emergency flashers, and pull to the shoulder. While in park, I rev up the motor to 2500 RPM, vibration. No diagnostic, or check engine light, temp is fine. Now I am REALLY scared.
I stop the engine, open the hood (like I can do anything, on the side of the road, at 6:00 AM). The engine smells warm, so I touch the coolant cap. Warm. I release a little pressure, and shrug my shoulders. On restarting the engine, I notice there is no vibration. I go out to the engine and manually rev it up, wit hthe throttle cable. NO VIBRATION.
I close the hood, and decide to try to make it a couple of miles to the next exit. I merge into traffic, NO VIBRATION. 55 miles later, I am pulling into my office, trouble free.
What gives?
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