Join Date: May 2001
Location: Goose Creek, SC
SSChevyFan is definately right. You will need to invest in a better manual. My favorite so far for my 87 Z-28 is the Haynes Repair Manual, and to a far lesser extent the Chilton. Code 34 is for the MAF, and i think the MAP came into use the next year. Small vac lines run all around the TPI engine, so take your time and trace the lines out of the manifold. I had a big problem w/ a vac line around 1/4 dia that actually caused my mpg to drop by 6! In any case, new manual, and check the lines. There should be 2 in the back, and either one or two running into the front off of a T near the vapor canister.