|Start with a complete tune up, plugs, cap, rotor, wires, (use BOSCH ignition parts, W7DC or W7DTC plugs!!) air and fuel filters, replace your injector seals and idle screw o-ring, tighten the injector holders, replace the injector holders if needed. Replace all the old and frayed cloth covered vacuum hoses, silicone hose suggested. Check your Jetronic grounds. Test your oxygen sensor. Check your throttle switches and idle boost valves, check your CIS system and control pressures, check your distributor's centrifugal and vacuum advance mechanisms, set your timing. Set your mixture while monitoring the duty cycle of the frequency valve, adjust the base idle.
Once you've made sure all the basic stuff is working as designed, should you still find improper running conditions, report back with your findings and we'll discuss it to a conclusion, more likely several conclusions.