Today I had a problem with my 380. I went to pick up someone and was running the air conditioning because of the hot weather. I stopped and shut the engine for about 5 mins when I got there and when I started it again the engine was shaking and choking when I gave it gas and black smoke was coming out of the tailpipe. Then when it would stop all of a sudden and it would be all smooth and then start again?

Is it the humid weather? What kind of weather affects these engines?

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99 C43
98 S420
99 C230K
01 C240