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Q: car has no power on 1990 Volvo 780

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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!
(1) Answer
Do you have a way to check fuel pressure? Does it have an EGR?
Do you have a diagram with the relay layout?

Zee