My 85 4runner has been a trooper going from utah to cali for college and has done great but when I had stopped for gas in cali this past time I noticed when I started it after putting gas and it started to have a pretty rough idle and misfiring heavy and my voltage dropped down 2 volts, originally 14.3. Battery is great, alternator great and brand new, starter is good. Grounds have been checked and are all tight clean and good. I cant really narrow down what could be this pesky problem. Im thinking Injectors but that wouldn’t drop my voltage, only other thing I could think of is my igniter going out or maybe my afm because I have had codes pop up for them a couple times but then go away. Any help is appreciated because I drive this thing for college in Utah thanks guys!