Originally written on Fox Sports  |  Last updated 6/21/12

BRISTOL, TN - AUGUST 21: Michael Waltrip, driver of the #55 NAPA Auto Parts Toyota, leans on his car prior to practice for the NASCAR Sprint Cup Series Sharpie 500 at Bristol Motor Speedway on August 21, 2009 in Bristol, Tennessee. (Photo by Geoff Burke/Getty Images for NASCAR)
Rodney Childers adventures in Sonoma will be temporarily delayed on Thursday as the crew chief for the No. 55 Aaron's Toyota and others from Michael Waltrip Racing take preventive steps to ensure their cars go the distance this weekend. After multiple engine failures for both MWR and Joe Gibbs Racing, Toyota isn't wasting any time getting to the bottom of the problems. Kyle Busch had engine failures at both Dover International Speedway and Pocono Raceway. Although he had engine issues at Michigan International Speedway, those weren't catastrophic. However, he did finish 32nd after making corrections to the car. All three of Busch's problems were unrelated. Mark Martin had the same issue at Michigan that Busch had the week before at Pocono. Martin completed 195 of 200 laps and finished 19th. For Martin, it was also his third engine failure this season. Childers said via text that the teams "are concerned." "We just don't need (anything) like that happening anymore," Childers sai...
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