The $13 timing light from harbor freight works like a charm, but you will probably need to pop off the upper rad fan shroud to see the timing marks on the crank pulley. No harm in loosening the dist. mounting bolt & rotating the dist. a small amount in either direction while the car is running to see if it smooths out your idle. (rotating it CW advances the timing). When smoother idle is obtained then adjust idle speed to about 850-900 with car idling in neutral. Then go back & adjust the timing to spec. using the light. You might have to repeat all the steps a few times & remember that the specs are plus or minus a very small amount so you can tune for what seems to work best or smoothest. You should also remove the dust cover from the crank angle sensor inside the dist. & carefully wipe off any dust bunnies & verify that the holes in the disc are all cleared out.