Im having trouble with my 1999 Chevy Blazer, it has 165k miles and does not have a check engine light, but the truck continues to stall when im driving, problem just started a few weeks ago and the only code it gives me is for the speed sensor, it does not smell like gas and i have already replaced the throttle body postion sensor and the crankpositon sensor, it has rough idle, and rough start sometimes as well, it will not pass 2k rpm and when i force it, it feels like the truck is choking, i'm running out patience, its the only vehicle i have for work, and it won't give me a code for anything else, I am starting to think it's my throttle body, but before i change it i wanted to get a 2nd opinion from you, any idea or tip on what else it can be? Thank-you for your time.
Have you checked the low-hanging fruit such as air and fuel filters, spark plugs, fuel pressure? What do your fuel trims look like?
Fuel pressure is good, spark plugs are getting changed tomorrow and I have not changed the fuel filter, guess I can start with that, there was a small vacume leak i just fixed i would not know how to tell you how the trims look.
i would not know how to tell you how the trims look.
Any scan tool that can display live data will tell you that. Even most cheapies will do it.
You might also check to see if you have a clogged catalytic converter.
https://www.youtube.com/watch?v=qJTmddbOxMk