I have a 96 convertable from Tennessee but now it's in Northern Indiana, and with colder weather and sometimes high humidity or rain, when I start up, the RPM's drop, the engine rumbles shakes and sputters and sometimes even shuts off. When I turn the key again, it almost always starts back up without an issue. Also, if I keep my foot on the gas, regulating the RPM's around 2k for 10 seconds or so, the rumbling goes away. The engine is a stock USDM engine with 118k miles on it and it gets regular tune ups and oil changes. Any idea what is causing this rumbling and how I may fix it.

Thanks guys!

-BD

Probably your ISC valve isn't opening when you start.

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where is that located?

On the bottom of the TB.

it only happens when the weather is particularly cold (around freezing and below) or sometimes when there's a lot of rain or humidity. Would the weather affect the ISC valve?

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hey i was having the SAME issue with my 7A-FE during this winter on the really cold days. i dont know what it was but i should clean my idle air valve. for about 30 seconds it would stumble and miss, then pickup and run fine.