Had my car at the garage for a while and replaced the intake part of the manifold where the mixture screw is (the bit where the tps is)

It ran fine from cold ticked over fine revs went up and down cleanly etc

So i drove it home got half mile down the road and it started badly misfiring! Just got it home and it won't rev and idles rough and stalls again! Also stinks of fuel!

What can i try next? Really getting too me now! Even considering just getting another engine!