Well I got her scanned last night and threw ideas back and forth with a buddy of mine.

P0121 Throttle Position Sensor/Switch A Circuit Range/Performance Problem

P0300 Random Multiple Misfires

P1406 Exhaust Gas Recirculating

My buddy was thinkin its either the fuel filter or the EGR, maybe a combination of the two. He tried to convince me its probably the computer but i seriously doubt that would need to be replaced. With the P0121 code am I going to be able to fix the sensor or is it soemthing id have to replace? Today im gonna throw a new fuel filter on it and unplug the battery for a few hours to see if it helps, anyone got more suggestions?

 

Put in a new fuel filter, sounds a bit better but still sounds like ****

 

FYI - When you swapped the coils, the Series II L67 uses a slightly hotter coil then a L36 (note the under side of the L67 coils should have a blue plug and the L36 has a gray plug). Admittedly, should not make a difference in your testing.

You might also want to have the ICM checked. To my knowledge the L67 and L36 ICMs are the SAME. That could be a good source for a random misfire as well. I believe AutoZone can also test the ICMs.

I would also have the fuel pressure checked. AutoZone probably has a Loan-A-Tool on that.

Those items may have a possible cause on the random mis-fires (just top of my head ideas). I don't have a chance to peak at the TPS and EGR codes, but if you wanna play swap parts, the L36 and L67 uses the same TPS (and I think that is constant beginning in '97). EGR, I am not sure of.

 

Fixed it, deleted the egr. It wont pass inspection now but it runs smooth.

 

Interesting. So, is it a bad EGR or a clogged passage for the EGR....?

Not sure the emission laws in your area, but for my area, I'd still have to fix it, but at least now you narrowed it down....

 

Never mind, the EGR was definately causing some problems but its still throwing P0300. It seems fine at low rpms but the moment you try to push it, it bogs down...

 

The only thing i can think of now is bad gas...

 

Go back to my comments in post #13 about the random mis-firing. I have a feeling those items may be of value to address.