Something weird at 3500-4000 rpm

[Andrew7dg]

Ok I am just going to add on to this forum also because I am having the same problem however I have been told that it could be the fuel pump that is given me problems. I hope Bunta won't mind

Symptoms are when I start to rev up to 4000 rpm the car starts to bog down and hesitate. The boost guage (which is the stock one and I should get an aftermarket one) says that it is getting like 13psi of boost.

Would the fuel pump have the same symptoms as a boost leak or is this for sure a boost leak problem?

I do have a 90 car with origional ECU and heard that those start to break down after a while and the first thing it seem like is going to go is the fuel pump but it is really the ECU. Am I getting this right or did I hear a bad rumor?

The funny thing is that before I bought the car the person said they did a leak down test on the turbo system and couldn't find any leaks so they suspected a bad fuel pump.

Thanks for your help