Hi rookie, I dont believe that cleaning the injectors or installing a performance chip is the solution. While both of these fixes will improve overall performance, they don't eliminate worn parts like the air flow meter. You wrote the newer engine had just 57K miles but the AFM could have a lot more. When you depress the accelerator pedal, two signals command the Digifant control module to increase RPM. The throttle switch signals the moment of off-idle and the AFM shows that the air volume entering the engine is increasing. If either of these signals are impaired the DCM will be "late" with the needed acceleration enrichment and the engine will hesitate. Also while the 2.1L needs no timing adjustment, the basic distributor position must be set correctly. The evaporative emission valve must closed at idle. Disconnect(temporarily) the evap PURGE line & plug the opening to the crankcase ventilation to eliminate this possibility. As for the leak, pressure test the cooling system(cold then hot) and determine where the coolant is coming from. Dust the area with talcum powder if necessary. All WBX motors should be pressured tested during every major service but few actually are. Regards, John |
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