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1998 should be fuel injected the choke is a cod start system containing the engine coolant temp sensor. intake manifold temp sensor idle speed control motor.
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there is an idle control motor and an egr valve. the egr valve opens to let exhaust gas into the intake manifold heating the engine more quickly. the idle air control motor controls a small percentage of the throttle, which may be the case here. but, either one is likely.
check your idle air control valve. depending on what motor you have, it will be located on the side on the throtle body. iac is either defective or dirty
This problem is caused by bad electric choke, or improperly adjusted choke. The Electronic Fuel Control system, as well as EGR, don't come into play until the thing's warmed up. Check the electric choke and its adjustment, also check the choke control on the right rear of the intake, and the charge temp sensor adjacent to the choke control, just in front of the distributor.
Check your MAP sensor, it work's like a choke, make sure it has vacuum, also check coolant temp. sensor, also work's like a choke, and if running with cylinder miss, check spark plugs wires.
Black smoke, running rich, two thing will cause that, CTS ( coolant temp. sensor) and MAP sensor, both work like a choke, check MAP senor first, make sure it has vacuum.
Raw fuel running rich, two thing control that, coolant temp. sensor and MAP sensor both work like a choke, make sure you have vacum at map senor and with scan tool check coolant temp. senor, also have your catilic converter check, if clog will run rich not enough air going in, so to much fuel.
Your choke is working to good, to much fuel not enough air, if smoking after engine is at normal engine temp.you need to have coolant temp. sensor or your map sensor check, both act like a choke, you'll need to do a computer scan, also have engine check for a miss fire, well also cause a rich problem.
Check the MAP sensor and the wire harness to the map sensor. Next time it will not start, try disconnecting the MAP sensor and see if it starts. IF it does then change the sensor. Good luck and hope this helps.
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