Toyota Repair: engine miss, combustion chambers, coolant leak

Question
i have a 95 4runner v6.its runs rough after start and idle. intermittent miss. sometimes white/gray smoke when ruuning rough..dealer service thinks it is NOT head gasget.. some water comes out tail pipe.. the thermistat has been removed.. i live in georgia the temp has been 95 and dry..some days runs good and other days rough.. PLEASE HELP!!!!!!

Answer
I don't know what kind of tests the dealer did to determine that the headgaskets are not the problem, white/grey smoke indicates that there may be a coolant leak into the combustion chambers, these engines had headgasket problems and the is a Limited Service Campaing in effect(LSC V-06) have the dealer run the VIN# number through Toyota's TIS network to see if it applies to your 4-Runner.
When you went to the dealer and they told you it was not the headgaskets did they by any chance give an opinion as to what the actual problem might be?
I seems unusual for a dealership to tell you what is not wrong with your vehicle and offer no recommendation on how to fix your problem.