So I leave work early Friday so I can rush to the track (85 miles), for what feels like (on the street anyways) my first solid 13 second run. Temp 73 at a 90' above sealevel track, baro's reading 14.6 sounds great so far right? Ummm NOT Truck left alright felt alright shifted 3-4 yum somethings not right at half track felt slower top of 4th layover begins 4-5 blah falls on face ............... 14.59 @ ARE YOU READY 89 big ones! So I look at my Log and fuel drops to 9600ish when it happens, now i run to the parts store 15 miles get fuel filter (45mins) after they find it! Its now nine o'lock and time for the 1 1/2 hr drive home!! FUN!! Guess its time for shim and lift pump! Funny thing is I made 10 street runs this week no problems-go to the track and SLOW motion!