It's raining, it's pouring, my Gr. Marquis is snoring!!

[mgmowner]

I purchased a '99 Grand Marquis one month ago with only 42,000 miles. However, it doesn't want to start when it rains. It will, but I have to keep my foot on the accelerator when I come to a stop, or she dies. Any ideas? Thank you in advance for your help!

[ChiTownMaraud3r]

Clever thread title.

Have you checked all of your intake up to the manifold for any leaks? Or you're electrical system, battery positive and/or negative posts?

[fastblackmerc]

Check all the connectors under the hood. Make sure they have no moisture in them and they are tight.

[Got_1]

sounds like water is getting to the ignition system somewhere. i think the 99's were COP?? run the car and get a little spray bottle with water and spray each coil one at a time and see if the idle drops.

[LeoVampire]

I had a 93 and found out quickly that the after market plug wires allows water to get past them and cause an arch.

Only wires I could run was the OEM ford wires to stop the problem.

[69marquis conv]

The foot required on the pedal to run at idle points to the IAC valve. Don't know about the rain issue.

[mgmowner]

Thanks everyone for your help and responses. I took my Gr. Marquis to my local mechanic for a tune up. Besides the tune up, he also cleaned some kind of filter (?). He told me sometimes after a fuel filter is changed, just a slight amount of dust gets in, causing problems. Hopefully, the problem is solved. I did hear him say 2 times, "This is a nice car." :-) Thanks again!