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The pressure in the tank should be negative (vacuum) if you've been driving a while. If not, you may have knocked off a vacuum or EVAP hose somewhere. That would likely make it idle lower and/or poorly, and EVAP system problems also usually set off the check engine light (like when you leave the gas tank cap off).


It does idle a little slow, around 500 to 550 and a bit rough. No CEL or codes, and I notices that sometimes there is a whoosh of vacuum. Is there a valve that could be sticking sometimes, not always?

BTW, anyone ever change the in tank fuel pump on these? How much trouble is it? I could not hear/feel mine running yesterday with the key on, engine off.