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1970 911 T cd box

Engine

Model: 911t, Year:1970, Mileage:190000, Type of use:Street use only
When the car is first started and cold it runs fine.But when it is hot It starts to miss and backfireuntil I downshift and it is better. We put a permatunecd box in and the problem went away until two weeks later and after driving the car and letting itset awhile it would not start. 20 minutes later it started but about a hour later it would not start.We hooked up the old box and it ran as beforewhen hot. My shifter bushings wenout that dayalso, so as soon as I fix them I plan to hook up the permatune to see if it works at all. The one commonfacture I see is the heat . Do not know. Also, couldthe rpm transducer be part of the problem. HELP.Thanks in advance. Please e- mail for futher infoetc.,and I will gladly call and talk this over.leo.smith29@yahoo.com

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