1998 Olds Bravada.... It is throwing a code P1351-IDM input circuit malfunction/Ignition control circuit, high voltage.... (IDM stands for Ignition Diagnostic Monitor) I have ruled out the coil, replaced the ignition control module, checked for spark at the cylinder, and it just wont start.... This vehicle is equipped with a crank AND a cam position sensor. Could these be giving bad readings throwing off the timing or something? The book does not give a check for either of those two position sensors.... This has got me really confused....Any ideas/suggestions?