Misfires and loss of engine power

Hi,

A backfire can be caused by a rich or lean fuel mixture. Have you checked the fuel pressure since the repair to confirm it is within the manufacturer's specs? If not, first do a visual inspection for vacuum hoses disconnected or damaged, and then check fuel pressure.

Here are three links you may find helpful. The first discusses the most common causes of a backfire. The next two are to help find a vacuum leak and check fuel pressure.

https://www.2carpros.com/articles/engine-backfires-while-running

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Also, make sure nothing electrical such as a mass air flow sensor was left disconnected and the air inlet tube between the air box and the throttle body is tight and fully in place.

Let me know.

Joe