Ignition timing and misfires

Pinging under load, backfiring, flat spots, poor throttle response.

Worn distributor (points, condenser, cap, rotor), incorrect timing, fouled or wrong-spec spark plugs.

1. 1 Set timing with a timing light. Factory spec is usually 10° BTDC at idle (verify in manual for your engine)
2. 2 Replace points and condenser (~$20 kit). Gap points to 0.4-0.5 mm
3. 3 Inspect distributor cap and rotor for carbon tracking, cracks, or corrosion. Replace both (~$30-50)
4. 4 Use correct plugs: Champion N9Y or equivalent. Gap 0.6-0.7 mm
5. 5 Consider electronic ignition conversion (Pertronix Ignitor, ~$100). Eliminates points, more reliable, better cold starts