I have an EVAP leak I can't locate. Started as a small leak code, now it's a large leak. I replaced the purge valve, vent valve, intake gaskets, pcv hoses, air filter, catalytic converter and O2 sensors. I still have the EVAP code, lose power going uphill 60mph to 40 by the time I get up there. Halfway up she will get a surge of power and the RPMs will soar to 3k, still won't let me speed up, just revs. Now she's making a deep rhythmic wub wub sound on acceleration. I've been to 7 mechanics in different towns, no idea. Nobody has a smoke machine either. I'm down to.. possibly bought a bad brand new cat ($180 bolt on eBay), fuel feed line real rusty, no leak yet attached purge line could have a crack, fuel filter/pump going bad or clogged because my filler neck is also rusted pretty heavily, secondary air injection, or cracked manifold. Please for the love of Scotty, help me out. This B is financed for $10k!!! AND I CANT GET OUT. First car, shh. Hubby's 2.2l Malibu lodged a valve on his way home from the Army. I have done everything myself minus trans rebuild and lines, new rack and lines. Grew up with 5 uncle's so I know a bit.