My Mitsubishi is vibrating until it reaches second gear. It idles fine in park or neutral, but when I put it in drive, the RPMs drop below 1 and the car vibrates. I can apply the break and give it gas, and the vibration issue remain. I replaced the plugs, wires, and air filter, not that those were related, but wanted to give more details. Also, I can put it in reverse, and the problems do not arise. Thanks for the help.
Have an accredited service shop check the engine and transmission mounts for failure
the engine reaction under load may be putting the mounts in a metal to metal contact that you feel as engine vibrations
will not happen in reverses as the load is opposite and there could be still rubber as an insulator
Possible dirty throttle valve and idle speed control valve.
Throttle Body Cleaning on vehicles without electronic throttle control (most 2003 and down)
You can in most cases repair this slow speed stall or unstable idle by cleaning the engine throttle valve and the idle speed control valve using a product called CRC Spray Throttle valve cleaner. Spray the cleaner into the air intake of the engine with the hose removed from the throttle body, the engine will try to stall so hold up the idle speed manually. Once you have used up about 1/2 can of the cleaner stall the engine out while spraying and turn the key off, disconnect the negative battery cable for 5 minutes and then reconnect and drive the car for a about 25 miles of varied driving modes. If this doesn't cure the problem you may need the fuel injectors professionally cleaned by the dealer service dept.
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When changing the spark plugs, I did notice sludge on one of the wiresets. It wasn't on the plug itself. I suspected engine mounts but it seems that if that were the case, we would have the same issue in reverse. Seems that the same would be true for the transmission mounts.
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