A recent post by STEADIRIC suggests that if engine runs when dipstick is pulled this may indicate a vacuum leak. I have two cars with the same engine...5 cylinder NF. The 87 5KS will continue running when the oil filler cap is removed. The 89 100 dies immediately when the cap is removed. Anybody know why? Inquiring minds ... Dave C. David Conner Columbus, OH '87 5KS, '89 100, '86 4KCSQ