The car is a 91 N/A basically stock besides exhaust. Car has 90k on original motor, no smoking at all. Well, the car has been sputtering and feels like fuel is getting cut off through out the whole rpm range. It happens randomly and so far, I have replaced the fuel filter, fuel tank, air filter, plugs & wires, etc. Before I owned it the car had sat for a while. I pulled 4 codes, they were:

Solenoid Valve (Purge Control)
Solenoid Valve (Split Air Bypass)
Pressure Sensor (Intake Manifold Pressure)
Throttle Sensor (Narrow Range)

I've tried unplugging the TPS once warm, didn't work. I checked all of my grounds too and even cleaned some. And I really hate to make this thread but its getting pretty frustrating and I need some help. Like I said, the sputtering and hesitation are random throughout the RPM range, the car idles at an almost perfect 800-700rpm too once warm. Any ideas?

 

Heeeeeeeeellllllllpppppppppp

 

Is it so bad that the car won't go anywhere? That is what is happening to me, it drives fine then all of a sudden it loses all power. It won't rev up and wants to die when you give it gas but it idles perfectly.

 

The solenoids arnt gonna cause that problem. Is is throughout the whole rpm range or just after a certain amount like 3800-8k? Have you adjusted the tps properly(may not be the cause but a good idea anyway). The pressure sensor if going bad could cause that. But a vac leak could cause these symptoms also and could cause the ecu to see false readings from the sensor.

 

Pressure Sensor (Intake Manifold Pressure)
Throttle Sensor (Narrow Range)

Fix both of those and your issue will likely go away.

 

I replaced the pressure sensor and unplugged the TPS once warm. She drives like a champ now, thanks for everyone's reply.