My 91 rex with a dohc zc started messing up a week ago. engine code 3 (manifold absolute pressure). The car cuts out and losses all power from around 2500rpms to 3200rpms. Tried changing the map sensor and checked the hoses on the intake manifold. problem still occurring. any suggestions???

 

I think I had the same problem before. Make sure your hoses are in the right spot...