Yes , Mike has a point with ignition parts . They might look fine but aren't able to perform under load . Make certain you have the proper sparkplugs (My jobber tried to sell me the platinum plugs also)and the cap rotor and wires are good . If the car is running right the plugs should have a dark red or tan colour to them , not wet , oily or black . Good luck .
1985 380SE- 160,000km 'Blistu' - Sold
1988 300CE- Eva,my garage mistress
2007 R350 4matic- The Black Pearl
2011 Ford Ranger-Work truck
1974 25' Trojan Sea Raider- 'Grannyknot'
2002 215 cm Atomic DH skis- Canadian SDH record holder, 175.5km/h- Vars 2010