cars still loosing power starting around 3500rpm
The car runs strong up to around 3500 rpm then it starts going flat. My fuel pressure is good. The fuel filter was changed less than a year ago. I have test for vaccum leaks and exhaust restrictions witha vaccum gauge and everthing is fine. I have replaced the coil,plugs a few times,plug wires,distributor cap and rotor. The car runs great at low rpm's. The timing is set at 12'. Could a have a bad cat even though when I tested for restrictions, the vaccum gauge went up when revving up to 2000rpm and held there? I have checked for codes and got a code 91 which was caused by faulty left 02 sensor harness,which was replaced along with that 02. I reset the computer already.
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89gt,3.27's,Auburn,tremec
3550,Steeda
tri-ax,aluminum
driveshaft,Asp
underdrives,Flowmast
er 3 chamber,March
ram air,130 amp
alternator,Koni yellow
struts,Kyb
shocks,Pirelli p-6000's,MM's lower control arms and full length subs
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