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RPM Swing...TPS?

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Old 07-25-2012, 09:14 PM
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Default RPM Swing...TPS?
Hey Y'all. Well I'am confused. I was aving isues with RPM Swing and the tranny slipping about 6 months ago. While this was happening I was getting codes for 'Transmission Components Slipping', 'MAF Siganl Out if Range', and 'EGR Valve Defective'. So I put in a used transmission, new EGR and a MAF Sensor. Well, it acted the same as before. So, I took it to the shop and they found my Cat was bad. So they changed it out ($400). Now the truck is running well. BUT... The RPM's are swinging once I get over 50 mph and I can feel the truck surging. Could this be the the TPS?
 
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Old 07-26-2012, 10:13 AM
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*UPDATE* On my way home this morning, RPM's started bouncing again. This time it threw a code (P1870). Any ideas??? That code is not listed in my book.
 
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