Hey there everyone. New to the forum and just bought a 92 f150 supercab with 157k miles. Has a few issues. The truck idles pretty high when I first start it, and doesn't drop in idle until I tap the gas. Then it idles normally. It idles a little rough however. Nothing too bad, but noticeable. On the highway I will occasionally get a CEL that flashes and then goes away. I pulled the codes and this is what I have:

122 C TPS below minimum voltage
327 C EGR valve below minimum voltage
328 C EGR closed valve voltage lower than expected
634 C Manual lever position sensor voltage higher or lower than expected

I was wondering if anyone had any ideas what my problem might be. Should I replace the TPS and EGR? I just cleaned the EGR and it seemed to have no affect. Any help would be greatly appreciated.

 

I have a 92 and I changed the TPS and IAC and stopped the High idle problem. EGR wise..might double check with book test procedures and go from there..Also look for vacum leaks..
TPS and IAC were 110.00 and took 20-30 mins to change. Bought from Autozone.
After replacing the tps and Iac..clear codes and see what re-appears..thats what I did..and found the EGR flow problem..was the small red and black hard plastic lines..red one was cracked.