i have a 1998 gt mustang and i was doing about 130mph when the car started massivly sputtering i pulled off and the car was barely running, i was forced to drive it home and the whole way it was at high rpms, when i would come to a stop i would have to put it in nutruel so it wouldnt die, also my ceck engine light was flashing anyways i did a compression test and all cylinders except # 1 cylinder and # 3 cylinder showed a 125psi and the # 1 and # 3 cylinder showed a 26psi and that was on the passenger side so i ripped apart the block thinking a head gasket and its not maybe a valve? or something else any advice would be great thank you for your time

 

Run a compression test at WOT. You should see it go up 10lbs. 125psi is low compression

 

For #1 and #3 to both go down at the same time is kinda strange for a head gasket. You may have to tear down the shortblock to see if you have a couple broken pistons. Also, take the head to a machine shop to have it magnafluxed. That's about the best thing you can do for heads.