1987 Chevy Blazer misfires and shakes

Tiny
BADASSJIMMY
  • MEMBER
  • 1987 CHEVROLET BLAZER
Engine Performance problem
1987 Chevy Blazer V8 Four Wheel Drive Automatic

my truck just started acting up the other day. While driving to work I felt something was wrong when I got off the highway the truck was misfireing and realy shaking. So later that day I changed the plugs, dist. Cap and rotor, changed oil and fuel filter, I also put some water remover in the tank. After all that it still runs poor with no improvements.
i tried to check the egr valve but it seams to be a sealed unit I also checked the wires the seam to be fine.I dont know what else to check and am running out of money for parts I dont need. Please help me
Sunday, December 21st, 2008 AT 11:01 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Misfiring can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
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Monday, December 22nd, 2008 AT 5:55 AM

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