New here. Need help.

[Franko2023]

How's it going y'all. Just bought a pretty decent 04 Tahoe for $700 off a buddy. I've spent near that trying to get it running right and I'm out of ideas. So I'm here looking for some insight. It had shifting issues so I replaced all the solenoids and shifter module. Needed a tune up so all new plugs, wires and coil packs. Also replaced the crankshaft sensor. Had a pcv hose dry rotted so replaced it too. It idles perfect. If you hit the gas soft and stay steady it runs fine. But if you give it any more than that it bottoms out bad. Gonna change the MAP sensors today.

 

[Trey Hardy]

How's it going y'all. Just bought a pretty decent 04 Tahoe for $700 off a buddy. I've spent near that trying to get it running right and I'm out of ideas. So I'm here looking for some insight. It had shifting issues so I replaced all the solenoids and shifter module. Needed a tune up so all new plugs, wires and coil packs. Also replaced the crankshaft sensor. Had a pcv hose dry rotted so replaced it too. It idles perfect. If you hit the gas soft and stay steady it runs fine. But if you give it any more than that it bottoms out bad. Gonna change the MAP sensors today.

No codes? You sure you dont have another vacuum leak anywhere? Could take a can of carb clean brake clean or starter fluid or I’ve seen people use propane and just spray it around the hoses or intake manifold and look for gasket leaks you would hear the idle surge when you find it.

 

[Trey Hardy]

What are you meaning by bottoming out?

 

[Franko2023]

No codes? You sure you dont have another vacuum leak anywhere? Could take a can of carb clean brake clean or starter fluid or I’ve seen people use propane and just spray it around the hoses or intake manifold and look for gasket leaks you would hear the idle surge when you find it.

Only code that comes up is from evap canister. I decided I'm changing the fuel filter on it today too. But I'll try spraying everything and see if anything pops up. But since I replaced that hose you can't hear air leaks or anything anymore.

 

[Miami-Dade]

@Franko2023 Moved you here for your issues.
Welcome from Miami&NYC!!

 

[Doubeleive]

i'd be more concerned about the maf than the map sensor

 

[Fless]

I'd be concerned about fuel pressure under load.

 

[Scottydoggs]

x2 on checking the fuel pressure.

 

[OR VietVet]

X3 on the fuel pressure. When you change fuel filter, see how hard it is to blow thru it.

 

[Fless]

I missed that you changed the crank sensor. It's recommended to perform a CASE relearn anytime the crank or cam sensor is replaced.

x2 on @Doubeleive's comment about the MAF sensor. It should be clean and Original Equipment. Not aftermarket or you're asking for trouble.