Today i was going on the freeway about 70mph and i accelerated to pass another vehicle and i noticed it wouldn't drive beyond 4000rpm i accelerated more and the care began to jolt and the speed decreased to 40mph. Pulled over and restarted car know when i accelerate when it gets to about 1200- 1600 rpm the car will jolt back and forth and the car won't go faster than 20mph. Just two days ago i replaced all the injectors because of an injector leak could it be that? Mechanic says its the Transmission know since he says it won't shift gears.

 

It's not likely the transmission, in my opinion. But to find out for sure, put the car in neutral or park and rev the engine. If it revs just fine, then it might be the transmission... but I suspect it won't be.

Do this
http://www.twinturbo.net/net/viewmsg...&msg_id=922678

then check your MAF and TPS.

I suspect bad fuel system or bad sensor.

 

also try the FI connections. perhaps one of them didn't get back on properly

 

I doubt that. A misfiring cylinder wouldn't cause rpm problems - I once drove on the highway to get to Ultimate Z with only 3 firing cylinders.

 

lol true. it doesn't EXACTLY fit, but it's a likely problem spot anyway just after they have all been replaced.

 

Those Z31 MAS sensors cause a lot of issues. That would be my first guess.

 

not a FI plug for sure. I'm guessing TPS... MAF will be expensive unless you find a good used one...