Narrow it down

[Jimynutz]

New here thanks for.any feedback in advance. My 96 es300 has 261k miles on it, runs like a champ. Mechanically could not be better. Check engine light code p0121 came up so I replaced  the tps. Car ran fine for 5 minutes then quit. Light came back on, I couldn't get a scanner so I searched around the Web and a suggestion I found was to clean the idle air control valve and sure enough it was clogged. Cleaned it up and ran great and died.  It'll run for 5 minutes then quit. Wait a little bit then I can start it then quit.  I can't take it anywhere because it will leave me stranded. Am I missing something what else can I check 

Edited October 27, 2016 by Jimynutz
Left something out

[Jimynutz]

No more check engine light but still dies

[gbhrps]

Jimynutz,

 

Read this thread on another forum:  http://www.clublexus.com/forums/is-1st-gen-2001-2005/527740-help-me-code-p0120-p0121.html