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One ground is on underside of intake manifold, runner #3 or 4.
Another is the ground strap from valve cover to firewall.
When that one tore on my car I saw how little actual copper was left. It was mostly green corrosion. Replacing it cleared up a rough idle that was persistent over 75-100 K miles.
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Sven: '89 245 NA, 951 ECU, expanded air dam, forward belly pan reaches oem belly pan, airbox heater upgraded, E-fan, 205/65-15 at 50 psi, IPD sways, no a/c-p/s belt, E-Codes, amber front corner reflectors, aero front face, quad horns, tach, small clock.
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