94 surging/bucking problem

to followup on my followup: i finally found the surging problem
there is a hard plastic tube that goes from the top of the (valve cover?) to the throttle body underneath the thin plastic engine cover on the right side. one end of this tube has a 2" rubber hose adapter (with 2 different inside diameters!) that had a crack in it. this evidently opened up when it got warm and closed when it slightly flexed, letting additional air into the throttle body. since this is after the MAF and IAC, it tricked the computer into increasing the gas delivered.
regards, charlie cave creek, az
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