1999 Chevy Blazer engine bogs down

1999 CHEVROLET BLAZER

133,000 MILES • 6 CYL • 4WD • AUTOMATIC

BLKKNIGHT

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my wife has an 1999 blazer. I first replaced the fuel pressure reg. first because the truck wouldn't start at times as well as not getting any power. and with that I changed the fuel pump. and with that , her truck ran fine, then within a couple of day, the truck now bogs down and doesn't have any power. If i start it, it idles fine and as well as being able to reg up with no problems at all. so i need a little help finding outthe problem and what do next.

Jun 27, 2009 at 6:19 PM

RASMATAZ

CAR REPAIR CONTRIBUTOR
75,992 POSTS

Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires

Jun 27, 2009 at 6:24 PM

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