I just purchased this van it ran great had a slight miss. After about 1 hour the van started to run very rough then stalled. Van would restart and run good in park but would stall when put into any gear. I took to shop they put in a new distibuter, cap, rottor, ign. module, plugs and wires. van ran awsome for about two hours and then stalled again. started in park but stalled again in drive. Please help.