working on my 93 b2200 .at first was making alot of white smoke . thought it was the head gasket . found out it was fuel vapor . It seems to be dumping fuel into cyl's 2 and 4 . Any ideas . Thought I would replace the ecm but it's 500.00 for a reman one . Does anyone have a list of trouble code for my year and model ? Any help would be appreciated.