anyone elses merc stumble in the wet weather like mine. especially the 420sel. I seems that when it is pouring rain the car sometimes has no power and hesitates when i give it gas. I thought it was old wires as my van used to not even start when it dewed outside beacause of wires with 150,000 miles on them. i replaced the wires but still nothing. I looked at the distributor cap but it was dry. maybe the belts are slipping?

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual