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Reply To: TBI 350 5.7l V8 # of issues

EricTheCarGuy 1

Whenever diagnosing performance issues, the mechanical condition of the engine is often overlooked. Especially with older vehicles, this is where I like to start. If you have low compression, or a loose timing chain, it can cause all kinds of performance problems that no amount of parts will fix other than replacing the broken or worn ones.

Here is where I suggest you start for how to diagnose performance problems, BTW, there is a video on how to use a vacuum gauge to find exhaust restrictions.

As for the leaks:

With the pinion seal, it’s quite possible that the pinion bearing is worn. At high mileage, rebuilding the rear differential and replacing the axle bearings is not a bad idea.

You might also find this video series helpful.

Good hunting.