Who best services/overhauls a 1984 Volvo 240 K-Jetronic manal efi sysyem. A Volvo dealer, auto electrician, specialist tuner?

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
Best Manuals

suprisingly, these are still available new, from volvo,as rebuilding them is NOT reccommended(unless you have specialist tools)you could get "exchange" units from a specialist supplier.(in the UK)chances are the pistons are rusted causing them to stick,you may be able to polish them up?

hi , as for service books i think volvo keep records like bmw do , thats if its main dealer serviced , think you would get a manal off ebay

it only runs ac cut it off

What kinds of problems are you having? I do have manuals but would probably have to email them to you. Maybe I can help you solve you problem. Worked on these for some time. The system uses a F.I. system called CIS. Not to bad to work with. Just don't turn anything unless you are sure you KNOW what it does or you can set yourself back a few days. Let me know.

the relays are under the glovebox or in that general area

If fuses keep blowing, then there is a dead short somewhere,. My advice would be to go to an auto electrician. You did not mention for which circuit/s the fuses blow.

Just a guess....
Have you checked all the vacuum hoses?

ok you must see what is missing. an injector requires 12volts to operate. the 12+ should be constant when key on and engine on or off,and the ground pulses. check both ways and see whats not there. if you have no pulse then ecm,cam sensor, or wiring faulty. is power+ is gone, then you have wiring trouble wich is the easier soulution. check and let us know

Replace engine oil and filter, air filter and fuel filter.
Drain the fuel tank and add fresh fuel.
Remove the spark plugs and put a squirt of oil in each cylinder. Remove coil lead and crank engine until oil pressure comes up.(light goes out),
replace coil lead and start engine.. it will blow smoke for first few minutes. Check trans fluid, brake fluid etc before driving. Theres a good chance the brakes will need an overhaul.