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Check under the manifold for cracked and misplaced air hoses.
Check the air flap is not touching the sides of the funnel.
Does the duty frequency change if you apply throttle?
Faulty injectors are rare but not unknown.....run some injector cleaner like Chevron's
Techron....some gasolines have it in already.
Clean up/check the fuse in the OVPR.
Has yours twin fuel pumps ?
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