I have recently received a 1986 GL Wagon that used to run great after normal tune up stuff. I haven't done it for about 2 years, it was my mothers car. The car currently runs and starts great up to about 3500 rpm the it acts weird. Checked the timing and it is at 6deg BTDC, just as the book says. When I rev the engine the timing goes completely off the chart, unreadable. When it gets high enough, somewhere in the 4k range the secondary starts to kick in. Seems to run normally unless driving, under load. Any suggestions would be appreciated.