Injectors problems, most likely

I have a 2000 Monte Carlo SS with the 3.8 liter. Ever sinced I replaced some vaccum hoses, it seems like the car isn't getting any gas. I know it doesn't have to do with anything, but it just seems odd to start up like that. The problem is that the car tends to die when reversing and sputters to go in forward drive. Also, whenever it happens, the RPM tach jumps rapidly. I believe my fuel injectors might be dirty, but not sure. Caould anyone please help...?

could have a crank sensor problem, if the tach is jumping erratically