My 89 SC 5 speed has been sitting for almost a year. It ran fine when I parked it. I put in a new battery and it cranked up on the first try,after running for a minute it started to idle poorly as if it was about to cutoff the tach would drop then go back to just under 1000 rpms and it did this until I shut it down. The cam sensor and the cranksensor was replaced in 01 and as I said the car has been sitting, could either of these sensors or both need replacement. A tune up also is order you know plugs and wires. It does not have the milage but the time since the last change is due. thanks for any assistance.