1996 Infiniti I30 rough idle and white smoke

1996 INFINITI I30
138,000 MILES
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YASU
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when the car is running for a long time all of the sudden when I am at the stop light the car start to get rough idle and when I step on the gas pedal white smoke comes out from the tail pipe. could you tell me whats wrong with it.

thank you
Jul 29, 2013 at 7:33 PM
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JACOBANDNICKOLAS
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It could be a couple things... one you won't want to hear, but I will tell you. As far as the rough idle, it could be caused by a vacuum leak, need of a tune up, a bad idle air control valve... The white smoke has me concerned. White smoke is usually the result of coolant entering the combustion chamber of the engine and burning with the gas. For coolant to get into the combustion chamber, either a head gasket is bad, a head is warped or one could be cracked.
Jul 29, 2013 at 7:38 PM
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RASMATAZ
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Its running rough due to coolant entering the combustion chamber could be as stated above-
Jul 29, 2013 at 7:58 PM
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JACOBANDNICKOLAS
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Raz, great to hear from you. Thanks for the support.
Jul 29, 2013 at 8:17 PM