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Discussion Starter · #1 ·
Have a '91 4.0. Looking to upgrade throttle body. Not all are created equal, suggestions? Also, should I add a TBS to the new TBS?
Lastly, when I start up in the morning or after has been sitting for many hours I get a check engine light/ idle drops to 400 and runs rough. Turn off, keep RPMs high, 1100, no light comes on. Basically if I drive right away, I am good. Suggestions??
 

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My little four banger did that awhile back, turns out it was the throttle position sensor, when i took it apart it was just a little mag strip of tape that was worn out. Got a new one for cheap, cleaned the throttle body up really good and haven't has issues since.
 
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