First off make sure your spark plug cables are inserted all the way in to the spark plugs. It's possible that you may have a bad ignitor or ignition coil. Check all your grounds and distributor wiring to make sure you don't have any bad connections first before you go on and purchase parts that...
x2 check the cel and see what codes you are getting that will give you an idea what you need to look into. Idle below 1k isn't a bad thing 750-900 is a good range depending on your build.
If you have a good tune on it you shouldn't have any issues with or without o2 sensors disabled. A good dyno tune will give you best performance based on the bolt ons you have but if you are looking to save gas I would recommend stock ecu. Ask yourself this do you want performance or gas...
First of all Year/make/Model sounds like you did a MPFI conversion make sure you have the injectors in the correct order running a resistor box if you are using the OBD-0 peak & hold injectors. Check and make sure you have power going to your IACV black/yellow stripe wire if not you need to get...
Have your local muffler shop drill and weld a bung so that you have a secondary o2 spot. Depending on where they decide to install the bung may require 2nd o2 wire extending.
Are your plans to stay OBD-0 or go OBD-1? I can make you the proper harness you need if you plan on going OBD-1 and I also have jumper harnesses available for OBD-0 to OBD-1 changeover.
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