I have no idea where to even begin on this one. I have a 97 Tahoe with a 5.7L Vortec motor that hasn't been running right. The SES light is on and every once in a while it stalls out when getting on the throttle. It will act like it is going to die and then pick back up to normal.

I scanned the codes an I am getting 3.

P0401 insufficient EGR
P0121 TPS error
P1345 Crankshaft position sensor / Camshaft position sensor correlation

I definitely shouldn't be getting the EGR code since I just replaced the pintle and cleaned the EGR system because of that P0401 code. And when I did replace the pintle the whole system seemed pretty clean and I couldn't figure out what was causing the error.

 

low egr pressure, tps not reading in the right position, and the crank shaft bouncing around in there... well, If it was in my driveway, I'd start with making sure you got spark to your plugs (and thinking how old are they). Then I'd run some throttle body cleaner through it, make sure the oil is good, and let it idle. If it cant idle, good chance your TPS is shot. If it holds a idle, might wanna check for vacuum leaks on the EGR, after that, I'd probably take it to a technician and get it checked out.