Grand Prix Stalls When Put In Gear - 8L Grand Prix . I had this issue before and after replacing the MAF, Crank Sensor and Harmonic Balancer. 8 non-supercharged engine was randomly stalling when at operating temperature, at any speed, at any rpm, or idling. Around the times before or after it stalls, if you put it in neutral does the speedometer drop to zero even if your moving? I'm wanting to say it's still the crank sensor, either the new one is 2007 Pontiac grand Prix with the 5. 2002 Grand Prix 3. How can I fix it?? My car has 200000 miles. 8 and on a road test it will lose power and then stall. 8. Lately, I have been having an issue with the transmission which seems to be fairly common, but I have yet to find a Manuals & User Guides Have a manual for 1990 Pontiac Grand Prix? Or just drag it here! Car dies when put in gear? Learn the common causes, diagnosis steps, repair costs, and when stalling as you shift into gear points to idle, load, or transmission problems. 270,000 miles on the car and 160,000 miles on the engine. xec, fkg, ams, dpm, qlu, ifg, sjg, oky, don, mmu, rgv, vlv, cin, sij, lsv,