I have a 2005 blazer 4wd 2 door 188000km check engine light flashing when I go on the hwy. The rpms go up and down when i come to a stop occasionally in the city. I have no codes coming up at all. It runs a little rough and sucks gas. I get 250km from a full tank. Thanks in advance to anyone with any ideas .I've replaced the following parts .

Plugs
Cap
Rotor
Wires
Distributor
Ignition module
Ignition coil
IAC
MAF
MAP
EGR
Spider
Fuel Filter
Fuel pump
Crack sensor
All oxygen sensors
throttle position sensor

 

fired the parts canon for sure
dont remember these things having a "Crack sensor", you live in detroit?
Sounds like a vacuum leak, pull the vacuum hoses off the upper intake and cap the ports on the manifold, do not unhook the PCV or Brake booster. and take it for a test run, note you will loose 4WD and HVAC direction controls with the hoses disconnected.

 

Had my buddy scan it and it looks like I need to replace the cam sensor. I'll have to pick one up and see if it solves my problem. No I don't live in Detroit. I live in Toronto. Thanks for trying to help. 😊

 

Hey neighbor! I was born and raised in Scarborough, Morningside and Sheppard. Live outside of milton now

Atleast you know you got a bunch of good parts on it now lol... thats the way I look at getting parts that aren't needed...

Did you keep the old as spares or to check if they were still good? Sometimes new is worst then original lol

 

Yes I absolutely kept the old parts. I kept everything but the iac and distributor. If I do need anything I'm sure I can find it online or at a scrap yard anyhow.