i have a 93 1500 4.3 tbi and i want more power and better milege cause i have bigger tires and a lift i was thinkin tbi spacer , cold air, jet chips power shift chip (wich is a stage 2 chip and trans comand), and a cat back exuast of if i save up a high flow cat and glass pack or other high flow mufler. if yall know any other tips of any thig good and cheep tricks please let me know

 

it also jumps from drive to nutral when i accelerate some times what do yall think that might be?