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The patient: 1991 Legacy 2.0 N/A, manual
The trouble: the car doesn't accelerate smoothly. It stutters when you accelerate rapidly - especially in second and third gear. Like the fuel doesn't get in properly or something. The problem is only slight - the engine never dies and has no major issues starting (only sometimes when warm). It's just annoying because when I want to accelerate hard sometimes there is a delay in the power.
The list of things I already tacled:
1. O2 sensor
2. MAF
3. Ignition wires
4. Fuel pump
5. Knock sensor (connected or not it doesnt change anything and there is no Check Engine light)
There is some dirt in the fuel tank but nothing major - I've used injector cleaner (the one you put in the tank) but it didn't change anything.
I have no idea what can be the issue here so I hope you will give me some pointers as to what to look for.
Best,
Karol.