Ford Windstar Vacuum Leaks From Intake Area Causing Lean Condition

I have had the codes that aay bank 1 and bank 2 running lean it dies at idle it cuts out on acceleration at times I have done tune ups had the fuel filter changed had the fuel injection tested had vacuum leak check changed and reprogrammed the main computer was being told it could possibly be o2 sensors or catalytic converter im stumped because they can't seem to figure out the exact problem and I don't have the money to keep spending while we try to figure it out

The Check Engine Light may illuminate with fault P0171 and P0174, my engine is 3.0L, only find repair kits for engine 3.8L, why?

Both banks running lean.They changed the intake manifold gaskets and 6 months later the same BS. They tightened all the bolts and that lasted 3 weeks.Last week they said the fuel pressure was low (22PSI) so the fuel pump and all the filters were changed.Three days later another check engine light.They said it was because of the cold weather and if you let it set in idle for two long when you are letting the engine warm up it would cause the check engine light would come on. Now I was told it won't matter and the manifolds would have to be pulled and they would silicone the gaskets so it doesn't leak anymore. I was also told that I could drive the van for 20,000 miles with no problems. They would split the repair with me but not until the weather warms up.

p 0171 p 0174

the runner valve is not working the control armes not conected also n0 2 plug misfireing