I have a Blox 74MM TB on my H with the Blox TPS. Im having some driving issues with bucking and weird acceleration randomly and also continuous self-revving from 1kRPM to 2500RPM. I'm thinking its the tps since theres no FITV and I cleaned the IACV and it wasnt even that dirty in the first place. I dont think its that. I have a spare b18a throttle body with the tps riveted on it but its a 58mm and the stock H throttle body is 60mm so is it worth keeping the huge 74mm on my stock H with bolt ons and replace the TPS. Or should I just replace the throttle body with the smaller than stock 58mm?

 

The throttle plate in the Blox is probably not sealing. You can take it off and test if you can see light through it with the plate closed. Because its so big any gap around the plate equates to alot of air. You can adjust the stopper but I have found the big bore aftermarket throttles generally suck with plate seal. You might be able to improve it by adjusting the stopper down but then the plate tends to stick on the bore.

OEM will be way better. I would run the OEM one even if its smaller than stock until you find something better.