<p>Please advise, I've encountered a problem with my 2002 Chevrolet Niva. Periodically, the spark on the first and fourth cylinders disappears — not completely, but it becomes noticeably weaker. Because of this, the engine doesn't develop full revs, the car struggles to pull uphill and drives with obvious strain. Maybe someone has encountered something similar and knows what the cause is? I would be very grateful for advice.</p>
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