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Message: <blockquote data-quote="akaNYr" data-source="post: 1448053" data-attributes="member: 22247"><p>I have a 95 Mustang GT 5.O SN95 with randomly surging RPM's for months. It starts 20 minutes after I start driving. The car don't move any faster but will jerk then bang when the RPM surges kick in, anywhere from 1000 to 2000 above normal. I changed cracked vacuum lines, cleaned the MAS & throttle body 5 times, lubed the springs & cables on the throttle body & cleaned and tested the iac, none fixed it. I tested the (non adjustable) TPS, it wouldn't go below 1.09v throttle closed and 4.85 wot. I bought a new (non adjustable) TPS & it reads 1.38v throttle closed. Car has more power & responded better but RPM's still surge, and NOW when idle RPM bounce between 800 and 1000. I set it for 750rpm. Nov.2018 I got codes 56, 45, 64. I don't have coil packs (code 45). Since then the only code I get is 564 (electric drive fan fault). The radiator fan goes on alot  sometimes, the car shakes a little  and volts go up. Any RPM help would be much appreciated.</p></blockquote><p></p>