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Cadillac Repair/1989 cadillac eldorado shutter when accelerating uphill

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Question
The engine is shifting into overdrive at 43 mpg and feels bogged down and
begins to shutter hard(like stalling a manual transmission) when trying to
accelerate uphill. Service engine light comes on occasionally but turns off
when the ignition is turned off. Any clue what this could be?

Answer
Perform this test procedure:

1. Turn ignition switch to the ON position only. Do NOT start the engine.

2. On the climate control panel simultaneously push and hold the OFF and WARMER (^) buttons and hold them in for 3 seconds and then release them.

Tell me EVERYTHING that displays as if you were video taping the fuel data display panel.

Turn ignition OFF.

Cadillac Repair

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Expertise

On hands professional expertise in all aspects of Cadillac diagnostics and repair mid 1970`s thru 2000 year vehicles. GM certified in electronic fuel injection, Automatic transmission, Heating and A/C, and onboard vehicle computer diagnostics.

Experience

Held over 15 GM certifications prior to retirement in 1989.

Organizations
Prior to retirement held several ASE certifications, numerous Factory certifications.

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