My '98 V70, n/a, 255k, has had a slight miss at idle for a while. The car still runs fine and is getting 26-29 mpg. If sitting a while in traffic (infrequent occurrance) I get the CEL and codes for engine misfire -- the most recent were P0300 random triple misfire & P0303 cylinder 3 misfire detected. In the last 20k or so I replaced spark plugs and wires, replaced injector seals, checked intake for leaks (throttle body & accordian tube), checked carbon canister check valve, and checked dist cap & rotor. Since 200k I replaced dist cap & rotor & oil venting system. Still runs slightly rough at idle and gives occasional CEL for engine misfire. Any ideas for other air leak paths or causes for the misfire?