Check for a vacuum leak in the hose that goes to the vacuum tank, also
check the tank itself, I have seen many cracked at the vac. nipples.
As for electrical problems I agree with Maxpower, take it somewhere for a
ECM fault test.
If the vacuum canister was cracked it would not affect the lite on the dash
when the cruise switch is turned on. The lite should still turn on but just
would not allow cruise to work. But im like you, I have seen many nipples
and canisters broke
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