2001 Mitsubishi Mirage 1.8L not starting, radio, lights and AC working

What is your question?

My Mirage 1.8L was not starting here and there for several years now (usually when temps were hotter outside. I thought maybe it was the starter (solenoid possibly?). One mechanic said not starter, but battery. I have used it on more than one occasion to jump my SuperDuty F350 Diesel Truck with no problem, so, I don't see how it can be the battery. Problem has gotten worse and very quickly, (within a few days) it is barely starting at all anymore. Could it in fact be a problem with the starter? or something else? Not getting any codes, check engine light not on. **Always had problems with power and lights dimming when AC running (more than your normal surge). **Always have problems with Static Electricity with this car (you can see ARCS of electricity at times) Winter, Spring, Summer and Fall. **Always had problems with feeling of almost wanting to stall when stopping at a light after driving on Highway for a long time (especially when temps are warmer) Please help. Thank you.