Is the intake gasket a common problum in 99 blazer with 4.3 motor?

While not the *most* common problem in a 1999 Blazer with a 4.3L engine, a failing intake manifold gasket is a relatively common issue, especially as the vehicle ages. Several factors contribute to this:

* Age and Heat Cycling: The gaskets are subjected to high temperatures and constant expansion and contraction, leading to eventual deterioration and leaks.

* Material Degradation: Over time, the gasket material can become brittle and lose its sealing ability.

* Improper Installation (during previous repairs): If the intake manifold was ever removed and reinstalled incorrectly, the gasket might not have been seated properly, leading to premature failure.

So, while it might not be the *number one* problem you'll encounter, a leaking intake manifold gasket should be considered a reasonably likely possibility when troubleshooting various issues like rough running, vacuum leaks, or loss of power in a higher-mileage 1999 Blazer with a 4.3L.