Hi, My 86 300e starts fine when cold, runs fine when cold, then soon as it gets hot it runs very very rough and stops if you take your foot off, and then takes forever or won't even start until it cools down.It also blows clouds of black smoke.<br> I am told it maybe the cold start valve, is there anyway of testing it before i change it??<br> Any help will great.<br> <br> Thanks<br> Rod
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