1) Combustion chamber conditioner (follow instructions on can)
2) or a slow trickle of water while the engine runs at a fast idle
(slightly more risky but usually equally effective)
Remove cylinder heads, wire brush cylinder head and piston crown,
grind down any sharp edges, re-assemble. flush coolant system install
new thermostat. buy premium grade gasoline and enjoy.
If it were my car... based on age and mileage I'd almost be tempted to
try the water or combustion chamber conditioner. Some in the group
might even recommend taking the car on a good long hot fast run.
(also works in some cases). Though potentially more expensive :)
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