car cutting out

[wht99gtconv]

Hey I'm a 4.6 guy but my brother isn't. Anyways it started when he went from a 100 shot to a 150 shot. The car runs fine in the 1/8mile till it is almost at the end of the track then it starts cutting out bad. Have you guys ever had this problem before. The car is a 87 5.0.

 

[86bluecobra]

By cutting out do you mean he is on his rev limitor? The factory one is set for 6250 i believe in a stick car not sure on a auo.

 

[wht99gtconv]

The car has a c-4 in it