2001 Mercury Marqui. I just replaced the intake manifold. Started it up and idles great. When driving it upon acceleration the temp gauges goes up and down with a beep and has slow uneven acceleration. Once it get to speed everything works perfect. I am lost.

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Asked by Mar 12, 2015 at 12:01 AM about the 2001 Mercury Grand Marquis GS

Question type: Maintenance & Repair

2 Answers

1,215

Don't drive it, pull the manifold and replace the gasket. Scrape surfaces clean first. Look for signs of leakage between the water jacket and the intake ports.Be very careful. Change your oil just to be safe.

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