Try putting fuel injector cleaner directly into one of your lines, I forget which one it is, but have get a funnel and a friend to do this (also the cleaner). Turn the car on, take off the line, put the funnel on and start pouring the FI cleaner into it, have your friend hold down the gas a little bit (like 1500-2000 RPM) and just watch all the smoke come out the exhaust...Its a good smoke though so dont worry. I think its a vacuum line that you will be working with
