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Engine rapidly off/on/off/on/off/on at speed


 

Subject says it all. Have 2.5 installed with Precis ECU the harness conversion done by Busaru. Stock '91 auto tranny and stock 14 inch wheels. At 65 mph and above the engine starts bucking. The only way to stop it is to reduce speed below 65 mph. On a few occasions I have managed?to hit 70 before bucking sets in. At 70 mph the tach reads 4000 rpm. Has anyone got any ideas about the problem and how to fix it? I should be able to turn 6500 rpm easily with this engine but I have no particular need to do faster than 70 in most cases. The VSS is Busaru and is set 4 mm clearance from stub axle flange?bolts.?

All comments and and suggestions would be appreciated,

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