Well they should've at least offered to change the spark plugs for you. Or maybe the plug wire. I agree with okvortec. Take it a to a good mechanic instead of the dealer.

 

thats weird because my 95 blazer has a rough idle and i was accelorating to get up to 50 and my check engine light started flashing for about 15 seconds and then it just stayed on for like 4 days then shut off and just the other day it did the same thing while accelorating and it flashed for longer then 15 seconds. i dont know what is could be. someone said it was the egr valve. im not sure. if you guys could help that would be great

 

Here is a General motors Service bulletin... I'll copy it as it is

Subject: Information on Crankshaft Position Sensor Installation

Models: 1995 Chevrolet and GMC Trucks S/T Trucks
with 4.3L Engine (Vin W-RPO L35)

The CPS Must be **Fully Seated** and Held Prior To Tightening the hold down Bracket Bolt. Torque the bolt to 8-9 N.M (5.9-6.6 LBS.FT.) **Use Hand Tools ONLY-Do NOT Exceed The Torque Specification**

A sensor that is cocked and or Loose in the front cover Bore may cause the holding bracket to bend and or lead to setting the following DTCS:

DTC Description

P0300 Random Misfire Detection
P0301 - P0306 Cylinder Misfire Detection
P0337 Crankshaft Position Sensor Circuit-Low Duty Cycle Input
P1345 Camshaft Position Sensor Misinstalled

NOTE: Misfire Detection May Only Occur Above 2400 Engine RPM in this Instance

If These Codes are Detected,Check The Crankshaft Position Sensor For Proper Seating


I hope this Info is useful to anyone...(Maybe this should be saved somewhere) lol

 

but what if it seems like a constant misfire? and would i have to find someone with a scan tool to find this stuff out?

 

advance auto and other auto parts stores scan for free

 

oh cool thanks. i hope i can figure this out. and another thing when i accelorate at like 40 mph and up i can feel the truck catching and letting go. it kinda seems like the trans is slipping but then again it could be because of the misfire

 

When most ignition codes are set mainly misfire P0300 - P0310 Codes the TCC will not lock up. If you are driving at about 65mph the rpm should be about 2000, tcc is locked up. If it is about 2400 rpm at 65mph the tcc is not locking up and the torque converter is working in the fluid filled mode. You will have very poor fuel mileage.

The tcc should lock up at 39mph only after the temp in the trans reaches normal operating temp 30c - 130c.