have you tried using a stock p28? I'm assuming that since you said you had it tuned that you are running ( currently ) a socketed and chipped p28 with crome or uberdata.....
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RIP Kevin Gonzales AKA Slo_Si 9/06
RIP Robert Kolp aka 00ek 4/07
RIP Pablo Garcia aka FatHead 9/07
_Jake D