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We set the timing marks all go but went to start and it backfired through the intake. What does that mean?

We are setting time in a 91 Toyota truck with a 22re moter

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The reason the truck backfires through the intake could be because there is a loss of balance in the intake manifold valves. However, this is not too serious and can easily be fixed by you're a mechanic.The problem can also be because of a leak in the injection system. You should have this checked as well.

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