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Car has no power

(1990 Volvo 780)
in Belleville, IL on March 24, 2011
after reparing warped head, test drive at70miles hr. backfired after slowing to return home. checked timming,cylinder pressure,replaced master flow sensor. car starts but no power!HEIP!
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Popular Answer
on March 24, 2011
Do you have a way to check fuel pressure? Does it have an EGR?
Do you have a diagram with the relay layout?

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