All right, I've got a tbi 350 that I'm having a strange problem with. When the motor is fully warmed up, usually after being on the highway for 5-10 minutes, I'm getting a check engine light. Strange thing is I'm getting both codes 21 and 22. I got this code when my IAC was junk and caused a massive vac leak, but I replace the tps at the same time. How can I be getting a high and low tps voltage?
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By the way, the motor seems to be running fine. I'm not having any noticable issues, other than that pesky check engine light.

 

Well, since there has been no response yet, I'd thought I'd give you an update. I have not seen the check engine light while just driving around town. Though I have noticed that my IAC may need to be reset or replaced. When I first start it up, it occasionally will idle up and down by 200-300 rpm like the IAC is acting up. I will double check that. Otherwise the code only pops up while running on the highway at elevated rpms for a while. If anyone has any ideas, please let me know.