low power at 2500 rpm and beyond?

Question

My 1988 Nissan Stanza (CA20S) has low power output at 2500 rpm and beyond. Actually, it's like hesitant to rev up at that point. Very dangerous when overtaking at high speeds.

It has been stocked at our garage for a couple of months. My father failed to start its engine once in a while. So we had it checked by our mechanic and he pointed the carburetor as the problem. The carb was cleaned and repair kits replaced but to no avail.

In addition to that, the engine sputters when at idle . . . But when cruising, everything is fine. Just don't go beyond the 2500rpm mark.

What is the problem with it? 

Thanks in advance!

Jeremy A · Accepted Answer

Just going to have to go threw everything make sure all wires are plugged tune up etc  obd1 so check the codes
Pulsar 88-90 1.6, 1.8 Y Procedure:
Sentra 88-90 1.6 • All except 200 SX: Access ECU (lo-
Stanza 87-90 2.0, 2.4 cated under passenger seat) (N5)
200SX 87-88 2.0, 3.0 (except Stanza Wagon, which is located
under driver’s seat).
• 200 SX only: Access ECU (located
behind driver side kick panel) (N6).
• Turn ignition on. Using Nissan tool,
turn diagnostic mode selector fully
clockwise and observe LEDs on ECU.
When LEDs have flashed three times,
turn selector fully counterclockwise.
Observe both red and green LEDs
on ECU for codes.
Codes: Codes are displayed by blinking
of both Red and Green LEDs (N10). The
Red LED blinks first, followed by the
Green LED. The Red LED indicates the
first digit (tens); the Green LED indicates
the second digit (ones). Example:
one Red flash and two Green flashes =

Anonymous · Answer

If in fact the carb is clean, get a new fuel filter next, then plugs then plug wires.  My guess is that it's the last on the list but the others are cheaper and need changing more often.  Bad plug wires will definitely cause what you describe...

Joseph · Answer

check the egr valve operation and the ignition components

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low power at 2500 rpm and beyond?

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