It all depends on when the SES light is coming on. When it comes on, is it
usually under hard acceleration, and when the light comes on does the engine
immediately bog and have pitiful power for a few minutes afterwards?
If no to the above, when does it come on?
In the meantime, check the wire that connects to the KS. It has a tendency
of getting fried to the exhaust manifold and shorting. The KS can be tested
for free at Autozone, and is cheaper than dirt to replace. If you yank it
to be tested, make sure the engine is COLD as the KS sits in the water
jacket and you will get soaked when you "pull the cork."
You need to check the base timing and make sure it's set correctly. While
the ESC system has no way of "knowing" where the base is set, it does expect
a certain amount of knock (or no knock) under certain driving condtions, and
when it doesn't happen it'll just assume the KS or ESC module is crapped out
and spit a code 43 at ya.
Also, are you getting any knock under load?
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