I have a 95 blazer with 4.3 CPI for lower intake manifold gasket and now running rough putting with check engine light on so put the scanner on it and getting codes: p0122, p0300, p1122, and p1406. Now the p1406 is the egr stuck in position. Its a problem I get every few months.. easy fix.. but the other three codes I'm wondering if they are related to each other and how would the tps get intermediate low voltage (p1122) thanks in advance

 

If the TPS is not plugged in, or it was disconnected with the ignition in the RUN position, the DTC will set. Is it possible this may have happened during the intake gasket replacement?

With DTC's, always diagnose and repair the first DTC, clear the memory, and perform the General Motors Driving Cycle to confirm the repair. If the SES light comes back on, retrieve the DTC's and repeat the process until the SES light remains off after the drive cycle is completed. When certain DTC's are set in memory, they can cause other DTC's to set as well.

P0122 is Throttle Position Sensor Circuit Low Voltage. Follow this flow chart and it will correct the problem: https://blazerforum.com/forum/diagno...plained-35161/

 

Well I replaced the tps with a new unit and cleaned the egr and after I did all that Idisconnected the battery for awhile to see if the seslight would go out and it did but still running rough also poured fuel injector cleaner from Napa in just to through that out there

 

Still running not running right

 

The SES light did not come back on after performing the General Motors Driving Cycle but it still is not running right? What are the symptoms?

 

The ses light came back on after a few minutes of driving and the symptoms I have is its just running rough especially at a complete stop while in gear and it just lacks the power it used to have before all of this

 

What trouble code is in memory now?

 

The p0300 I'm going to start checking the plugs and wires and see where that takes me

 

this should have most obd 2 codes

https://blazerforum.com/forum/tech-a...agnosis-26408/

this should help you

 

P0300 is almost always set due to a fault with secondary ignition components: Ignition coil, distributor cap & rotor, worn distributor bushings and or gear, spark plug wires and spark plugs. I think you're on the right track... make sure you use AC Delco plugs.