the filter im not sure car was parked for awhile though . i was thinking gas too , i try to go to the same station (hess) ive put in redline injection cleaner for to gas fulls but not on last one ive always put in 87 but in last to tanks ive put in 89 . miles it only has 123000 but not sure howit was treated . as for as i know im the 3rd owner last one says any parts and work was done by dealer . before this car ran fine pulled hard and fast .