All lights on with a surge

I have a 2008 toyota tundra, I've changed all the coil packs and plugs, all my lights are on. It's surging and goes into limp mode after 45 miles per hour. Found a leak in my pressure regulator vavle, changed it out and the problem is still there.

 

I hope someone here on the forum can help you with your issue.

 

Welcome from SoKal....

Have you pulled codes? This would be a better guide on whats going on... you may have the dreaded SAIP failure sending the truck to limp mode...

 

What is saip?

 

Pulled codes says multiple misfire and MAF

 

Start with MAF inspection and cleaning. If you’re running a CAI with oiled filter it can cause contamination if over oiled. Check all vacuum lines and hoses routed to the intake manifold and tube.

 

Saip secondary air injection pump...
If you unplugged the MAF with the bsttery connected it will make your dash light up like a christmas tree... i eould decond a vacuum lrak somewhere... was gonna suggest that, but spaced out this morning

 

Welcome from LA (Lower Alabama)! You might also want to ask @Ruggybuggy in the Ask the Toyota Mechanic thread.
https://www.tundras.com/threads/ask-the-toyota-mechanic.2404

 

Welcome from NY.