Yeah you have an OBD1, 96 and up they made the OBD2 universal in all cars. i thought that autozone might have the connection OBD1. I have my own OBD from MAC tools with a connector. sorry bout that.
try putting the original intake manifold back on and see if it still does the samething. but that really sounds more like a missfire to me. try this, while it's sitting at idle, pull out the end of the spark plug wire that connects to your spark plug and see if it dies. do that to all four cylinders one at a time. if you pull out one and it keeps running the same, without getting worse or without dying, then you know that cylinder is missfiring. next, if you have that problem, take a fairly long screw driver, flat head or phillips, and stick it into the hole of the spark plug wire were the spark plug would go. wrap a rag or something around the other end of the screw driver, the plastic side on most screw drivers, and hold in your hand. hold the metal shaft of the screw driver about 1/2 to 3/4 of an inch away from a metal surface. Have someone else start the car, and you should see an arch from the shaft of the screw driver to the metal surface, and it should be consistent. if you see the spark (arch), next take that same spark plug out of the missfiring cylinder. connect it to the spark plug wire and hold in your hand with a rag. Now have someone else start the car again. you should be able to see the arch in the spark plug and it should be just as consistant as the arch from the screw driver. if you don't then try checking the gap of your spark plug with a gapping tool, it should be somewhere between 28 and 32. Also, be careful not to damage the ceramic when checking the gap, if your spark plug is ceramic plated.
Or you can just buy a whole new set of plugs and try that too. It will be alot faster. If that doen't fix the problem then get somebody to check it with a timing Gun/light. If your timing is straight and on point then next step is fuel regulator right above your fuel filter, if not the fuel filter it's self.
:irock: