agavo_64

i have a 02 chevy blazer ls and my service engine soon light came on light 2-3 weeks ago so i sat my truck dwn and only used in my town but when im driving once i go up to 40 -50 mph my trucks starts forcing itself and doesnt want to change gears until i release the accelerator then it switches but its still forcing itself it only happns once i hit in the 40s.... i connected the computer to it for the service engine soon light and it gave me a code that was for the caddilac converter and for the maf unit does it matter that i have a intake instead of the stock one???...but i need help please