Black Smoke,excellerator not responding

Hey guys thanks for the support y'all got an issue my 93' super custom had an issue with misfire/jacking when idling took it to the mech who said it was a small fix,now turns out the cars is not responding to excellerating and also producing enough black smoke,really pissing off,want to do a 472km journey asap anybody...

Long shot but, disconnect the battery for 30 minutes. Reconnect and see if it is sorted.

Thanks clive,I took it to an electrician and turns out that they looped the injector pump across the sensor,so it got a shot and damaged some components on the computer box and the injector sensor is also gone man but got some spares to fix that..stupid expenses