I had a bad idle and had never changed the upper and lower intake manifold gaskets on my 1995 3.5. I took it a part and the lower gasket was like dust. Put it all back together and it still idles rough and vibrates as you accelerate. I used Felpro gaskets and followed the info in the factory workshop manual. It still does not run right. I used some carb cleaner to try and locate where it is leaking. Still can't figure it out. Any tricks or suggestions???
I thought I had everything spotless before reassembly. The air filter is new and so are the plugs. I double checked the firing order. I also double checked the timing belt timing. All dots line up perfectly. No codes.
No fuel smell. I have double checked all vacuum lines.I think the plugs are Autolite Plats.(low miles) It's not misfiring. It just idles rough and does not smooth out until above 3000 rpms. IAC is clean. I am leaning towards taking it a part again.