Hi Guys

I have few problem in my datto,car started having misfire suddenly then i checked the contact point and adjusted it i saw My distributor rotor had a black burn mark like this sample photo in only on one side like this ,and also i noticed it has become bit curved because of long use i guess. what causes this ? i sand papered the rotor now no misfire car revs as usual ?i have a bit doubt about my rotor and distributor cap , are there any way that i can check whether my distributor and rotor are providing enough spark to the plugs,i heard that providing a weak spark for some time will cause spark plugs to be defective ? is it true ?
but most of the time i see cold start drops water from exhaust too .
and yesterday i got a problem the car doesn't idle it suddenly dies in law rpm, but you can rev it as usually but doesn't sit idle , it is blocked idle jet(slow jet) right ?

i checked all the vacuum line etc everything is fine

thanks
regards
sumith

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